Thursday, February 10, 2022

Access and transparency in transplantation at the TTS 2022 meeting in September

 Covid-permitting, I'll be flying to Buenos Aires in September to participate in person in the 2022 international meeting of The Transplantation Society (TTS), with a focus on access and transparency in transplantation.






 Monday, September 12, 2022 – 09:40 to 11:10

Transplantation in a moving world; migrants, refugees & organ trafficking
Dominique Martin, Australia
Steps towards increasing deceased donation worldwide
Beatriz Dominguez-Gil, Spain
How can we optimize local economics to achieve self-sufficiency and ethical transplantation in an unequal global economy
Alvin E. Roth, United States

Wednesday, February 9, 2022

Stability in Matching Markets with Complex Constraints by H. Nguyen, T. Nguyen, and A. Teytelboym

 Here's a paper motivated in part by the issues that arise in matching refugee families to localities in which to settle (once they have been granted asylum in a particular country).  It's also a good example of the way that operations research methods are playing an increasing role in market design.

Hai Nguyen, Thành Nguyen, Alexander Teytelboym (2021) Stability in Matching Markets with Complex Constraints. Management Science 67(12):7438-7454. https://doi.org/10.1287/mnsc.2020.3869

Abstract. "We develop a model of many-to-one matching markets in which agents with multiunit demand aim to maximize a cardinal linear objective subject to multidimensional knapsack constraints. The choice functions of agents with multiunit demand are therefore not substitutable. As a result, pairwise stable matchings may not exist and even when they do, may be highly inefficient. We provide an algorithm that finds a group-stable matching that approximately satisfies all the multidimensional knapsack constraints. The novel ingredient in our algorithm is a combination of matching with contracts and Scarf’s Lemma. We show that the degree of the constraint violation under our algorithm is proportional to the sparsity of the constraint matrix. The algorithm, therefore, provides practical constraint violation bounds for applications in contexts, such as refugee resettlement, day care allocation, and college admissions with diversity requirements. Simulations using refugee resettlement data show that our approach produces outcomes that are not only more stable, but also more efficient than the outcomes of the Deferred Acceptance algorithm. Moreover, simulations suggest that in practice, constraint violations under our algorithm would be even smaller than the theoretical bounds."


"Around 50,000 refugees are resettled to the United States every year. Nine American resettlement agencies coordinate networks of dozens of local communities (which we refer to as localities) that support refugees during their first few years in the United States. Localities are allowed to admit different numbers of refugees and offer different services (e.g., language support, support for large families, support for single parents, etc.) that may or may not match the needs of the refugees (Ahani et al. 2021, Delacrétaz et al. 2019). In order to secure government approval to conduct resettlement, resettlement agencies must aim to maximize the number of refugees who are employed within 90 days of arrival. Some resettlement agencies have begun using integer optimization and machine learning in order to improve refugee outcomes (Bansak et al. 2018, Ahani et al. 2021); however, as far as we know, refugees’preferences over localities are presently not collected anywhere in the world.

...

Our algorithm is a novel combination of Scarf’s Lemma and a rounding procedure. We build on the approach of Nguyen and Vohra (2018); however, we make a number of substantial extensions and modifications. The novelty of our approach is the way we apply Scarf’s Lemma to capture group stability. To use Scarf’s Lemma for stable matching problems, one needs to create a constraint matrix Q, where each column corresponds to a possible blocking coalition. Hitherto, two methods to construct such a matrix have been proposed: first, with columns corresponding to all possible blocking coalitions (Scarf 1967); second, with columns corresponding to small blocking coalitions (a hospital and a doctor or a doctor couple and two hospitals) (see Nguyen and Vohra 2018). Although the method of Nguyen and Vohra only obtains matchings that are immune to deviations by small coalitions, Scarf’s method can, in principle, capture group stability. However, the disadvantage of Scarf’s method is that the resulting constraint matrix is not sparse, which prevents us from guaranteeing small error bounds in the rounding procedure.

"Our main structural contribution is a new way of combining ideas from matching with contracts with Scarf’s method in order to create an appropriate constraint matrix. A contract specifies both agents in the match as well as a “price” for one of the dimensions of the knapsack constraints. Our method allows us to get the best of both methods: the sparsity of our constraint matrix does not change, but the prices specified in the contracts still allow us to capture group stability via pairwise stability."

***********

Earlier:

Sunday, October 19, 2014

Tuesday, February 8, 2022

Is applying to college too hard?

 While there are concerns that electronic application services like the common app have led to an explosion of applications, there are also concerns in the opposite direction, that applying to college remains a barrier particularly to students who don't automatically think of college as an option.

Here's a story from the Chronicle of Higher Ed about an initiative to ease the application process.

Rethinking the Act of Applying to College. A tedious process that puts the onus on students may need an overhaul.  By Eric Hoover

"On Thursday, the Coalition for College, a membership group of 162 institutions with a shared online application, announced a plan to ease the challenge of applying. As part of a new partnership, the organization will embed its application process into Scoir, an online college-advising platform used by students at more than 2,000 high schools nationwide.

"Instead of creating a Coalition application and typing information into a separate website, students with a Scoir account will soon be able to apply to any Coalition college by transmitting an admission form prepopulated with information — demographic data, grades, test scores, and so on — that would already reside under the same virtual roof.

...

"The more complex the application process, the less equitable it becomes."

"That was a key line from a report published in January by the National Association for College Admission Counseling and the National Association of Student Financial Aid Administrators. The report, which imagined what the college-application process would look like if racial equity were the main objective, included findings and recommendations drawn from interviews with a panel of admissions and financial-aid experts, as well as students."

Monday, February 7, 2022

Market design at the Econometric Society summer school in Dynamic Structural Econometrics

 Here's an announcement that came by email from the Econometric Society (which reflects the continued evolution of market design):

ECONOMETRIC SOCIETY SUMMER SCHOOL in DYNAMIC STRUCTURAL ECONOMETRICS

Theme: Market Design

Massachusetts Institute of Technology

August 15–20, 2022

APPLY AT http://dseconf.org

DEADLINE: FRIDAY APRIL 1

We are pleased to announce the next event in the sequence of Econometric Society summer schools in Dynamic Structural Econometrics.

The primary focus of DSE summer schools is to provide early-stage PhD students with the tools to carry out research in the rapidly developing area of empirical market design with a strong emphasis on closely integrating economic and econometric theory in empirical work. The school covers the theoretical and methodological foundations in market design, the state-of-the-art methods for estimating models that are fundamental in this literature and providing an overview of open questions. We will use a variety of empirical applications to illustrate how these tools and methods are combined to address important applied questions.

The 2022 Econometric Society DSE summer school consists of 4 days of lectures held in conjunction with the Dynamic Structural Econometrics Conference 2022 (August 19-20). The conference brings together top junior and senior researchers from the field to discuss recent advances in theoretical and applied work. The summer school and the conference are hosted by the Massachusetts Institute of Technology.

Lecturers of the summer school and invited conference speakers include:

Nikhil Agarwal (Massachusetts Institute of Technology)

Fedor Iskhakov (Australian National University)

Irene Lo (Stanford University)

Victoria Marone (University of Texas at Austin)

Robert A. Miller (Carnegie Mellon University)

Whitney Newey (Massachusetts Institute of Technology)

Ariel Pakes (Harvard University)

Parag Pathak (Massachusetts Institute of Technology)

John Rust (Georgetown University)

Bertel Schjerning (University of Copenhagen)

Paulo Somaini (Stanford Graduate School of Business)

Daniel Waldinger (New York University)

Interested students and presenters are invited to submit their applications via the website http://dseconf.org. Application deadline is April 1, 2022.

Sunday, February 6, 2022

Interview on market design (in Polish)

I was interviewed by Sebastian Stodolak about market design and repugnance, in the Polish journal https://www.dziennik.pl/tagi/alvin-e-roth. Aside from being in Polish, it's behind a paywall. 

But here's an excerpt on which Google Translate works moderately well (without however giving you the feeling that the original discussion was in English...):

Prohibited activities. They repel, they don't disappear (Zakazane działalności. Odpychają, nie znikają)

"DGP: You design markets. What does that even mean? 

Alvin E. Roth: It's nothing new. People have always designed markets. They must already have been doing this in order to be able to trade stone tools over long distances. For example, they had to agree on the terms of this trade.

And that was designing?

In some sense. Without the design of appropriate rules, banking, auction systems or exchanges that were created during transactions carried out in an informal atmosphere in coffee shops in London or New York would not have been born.

It's just that most of the time people were doing fine without economists, and suddenly you show up with your friends and you even get a Noble for it!

It took a long time for economists to recognize the importance of design. For a long time they thought about markets in a very abstract way, aggregates, they talked about supply, about demand. This was the case until game theorists such as William Vickrey and the recent Nobel Prize winners Paul Milgrom and Bob Wilson appeared in economics. It was only when we started to look more closely at the rules on which the market game takes place that we saw that markets are project-based and how these projects define their functioning.

Saturday, February 5, 2022

The black market in looted antiquities

 The market for ancient art has a dark underside, that involves not just the usual shady characters we expect to encounter in black markets.

The Atlantic has the story, focusing on the law enforcement work of the Antiquities Trafficking Unit of the Manhattan District Attorney's office::

THE TOMB RAIDERS OF THE UPPER EAST SIDE. Inside the Manhattan DA’s Antiquities Trafficking Unit. By Ariel Sabar

"When Matthew Bogdanos got a tip about a looted mummy coffin whose corpse had been dumped in the Nile, he approached the coffin’s buyer—the Metropolitan Museum of Art—with few of the courtesies traditionally accorded New York’s premier cultural institution.

...

"Bogdanos’s crackdown comes amid a broader reckoning over the West’s extraction of wealth from poor countries and people of color. The fiercest activists want Western museums to return all antiquities to their homelands, on the grounds that even legal acquisitions were tainted by colonial-era imbalances of money and power. Randall Hixenbaugh, one of Manhattan’s last surviving ancient-art dealers, told me that he has lost sales of well-provenanced objects, in part, he suspects, because sensational news stories have soured collectors on the entire sector. The push to make antiquities “unpalatable,” he contends, has less to do with the law than with an anti-European cultural politics.

"Particularly galling to Bogdanos’s detractors are his seizures of antiquities that have circulated, unquestioned, for decades. Among them is a 2,500-year-old limestone relief of a spear-toting Persian soldier, valued at $3 million. In 2017 Bogdanos removed it from an art fair at the Park Avenue Armory, as its enraged British dealer sputtered curses. The object had been owned by the Montreal Museum of Fine Arts since the 1950s. Spurred by a tip from a scholar, Bogdanos’s team used archival records, decades-old photo negatives, and interviews in five countries to argue that the relief had been filched in the 1930s from an excavation in Iran. The British dealer and a colleague agreed to surrender the relief without admitting guilt, and in 2018, a New York judge ordered its repatriation."

Friday, February 4, 2022

Kim Krawiec interviews me about repugnance on her podcast Taboo Trades

 Kim Krawiec interviews me on her podcast Taboo Trades:

She writes "Al Roth and I discuss hitmen, drugs, kidneys, paid sex, and other repugnances. We’re joined by co-hosts Madison White and Alex Leseney (both UVA 3Ls), with appearances from UVA 3Ls Thalia Stanberry, Caitlyn Stollings, Jackson Bailey, and Autumn Adams-jack. A good time was had by all!"

The podcast starts with a cold open, drawn from the body of the interview, in which I ask her co-hosts to help me hire a hitman to rub out a negative referee.  But mostly we talk about transactions that have no easily measurable negative externalities, yet that third parties nevertheless object to.


Thursday, February 3, 2022

The market for hitmen

Why are laws against hitmen more effective in most of the world than laws against drug dealers?  Yesterday's post was about a paper that models this, but that paper didn't try to look empirically at hitmen.  

The model suggests that the different availability of hitmen and heroin dealers might have something to do with how you would react if I asked you where I could buy heroin or where I could hire a murderer. In both cases I would expect  you to tell me what a bad idea that was...but you might proceed differently after that.  I think it is unlikely that you would call the police to report that I asked about buying heroin, but you might well call the police if I asked about murder. (And the police would likely react differently to the two potential calls.)


Over the course of writing our paper, I collected news stories that featured  attempts to hire a hitman, many of  which went wrong from the very beginning. The search for a hitman often ends with finding an undercover policeman.  The rest of this post consists of those news stories. (This isn't meant to substitute for serious empirical work; it's just a rouges' gallery of news stories...)

Here's an example from the U.S., where the police were immediately brought in:

‘Help me kill my wife,’ Monroe man accidentally texts to his former boss

"A 42-year-old Monroe man apparently thought he was texting a hit man when he offered to split a $1.5 million life-insurance payout for killing his wife and young daughter, according to Snohomish County prosecutors.

But the text addressed to “Shayne” was actually sent to the man’s former boss, who called 911 Tuesday evening and showed the message to sheriff’s deputies, says a statement of probable cause outlining the case against the suspect."
***********
Here's another:  Woman charged in Craigslist plot to kill Israeli ex-husband

"The affidavit said a person who responded to the ad contacted the FBI after meeting with Layman at a coffee shop in May. The affidavit said Layman used a PowerPoint presentation called "Operation Insecticide" and that the person who responded to the ad provided the written instructions to the FBI."
*********
And here's another:
Woman sentenced to prison after allegedly trying to hire hitman
"A District woman who was charged this summer with trying to hire someone to kill her estranged husband was sentenced to a year in prison Friday after she later pleaded guilty to attempted assault with a dangerous weapon.

Prosecutors say 39-year-old Brandi Myles of the District agreed to pay a man about $25,000 to kill her estranged husband ...

"The unidentified man notified authorities of Myles’s plan. Detectives then orchestrated an undercover operation in which Myles allegedly agreed to pay the man to kill her husband last November. The killing never occurred."

***********
and another
Oklahoma Dentist Accused of Killing Mistress' Baby Now Charged with Ordering a Hit on Mother
"KOCO News 5 reported Franklin approached an inmate being held at Oklahoma County Jail about the possibility of killing a witness in the murder case against him. The inmate was an informant for police, unbeknownst to Franklin."
*************


On the other hand, there are places where there are a lot of murders. Colombia was once one, when Pablo Escobar paid a bounty on policemen. Mexican journalists are now particularly vulnerable, see this NY Times story:
In Mexico, ‘It’s Easy to Kill a Journalist’

The story makes clear that journalists who run afoul of either corrupt politicians or drug gangs are often murdered.
*************
And in Ukraine, as told to the WSJ:
Requiem for a Hit Man
A doomed hired gun unburdens himself in a jailhouse interview that sheds light on the shadow battle between Russia and Ukraine

"Ukraine has become a magnet for hired guns as Kiev tries to fight its former master Moscow’s bid to reassert control. With a stalemate on the battlefront between Russian-backed rebels and the government, Moscow and Kiev appear to have turned to contract killings to settle scores and winnow the ranks of commanders in the war, Western diplomats say.
...
"In Kiev, many of the triggermen appear to be freelancers, moonlighting from their jobs in the Ukrainian armed forces or police, say law-enforcement officials and Western diplomats.
...
"Mr. Makhauri came to Ukraine, he said, to hunt down the agents Moscow sent to eliminate opponents abroad. He said the killings ordered by Russia came from two distinct directions—from Moscow’s federal security services, as well as the Russian-backed Chechen leader, Ramzan Kadyrov.

“I know who to look for and to stop them before they do anything,” he said from under a mop of long black hair, speaking politely in a vernacular Russian that earned him the nickname “Zone,” referring to someone from a penal colony. “There is a small number who do this kind of thing.”
**********
And from the NY Times:
Russia Ordered a Killing That Made No Sense. Then the Assassin Started Talking.

"Assassinations happen frequently enough in Ukraine that they are often just blips in the local news cycle. In 2006, Russian President Vladimir V. Putin signed a law legalizing targeted killings abroad, and Ukrainian officials say teams of Russian hit men operate freely inside the country.

“For the intelligence services, as bad as this sounds, murdering people is just part of the work flow,” said Oleksiy Arestovych, a retired officer in Ukraine’s military intelligence service. “They go to work, it’s their job. You have a work flow, you write articles. They have a workflow, they murder people.”
**************

It's not clear whether the hitmen are part of a for-hire marketplace, or if they are simply employees of the politicians and drug gangs.
Judging from cases in which organized crime hitmen turn state's evidence against their bosses, hitman is a job description for some American organized crime outfits as well. See e.g.
How An Infamous Mafia Hitman Rebuilt His Identity From Scratch
Heinous Boston mob killer became government informant
**********

And even if you find someone who says he's a hitman, there's a good chance you are talking to a policeman:

Ex-escort gets 16 years for trying to have husband killed
By TERRY SPENCER, ASSOCIATED PRESS WEST PALM BEACH, Fla. — Jul 21, 2017,
"Circuit Judge Glenn Kelley imposed the sentence on Dalia Dippolito, who was convicted last month of solicitation of first-degree murder. She was recorded on video and audio in 2009 as she plotted to have Michael Dippolito killed, telling an undercover detective she was "5,000 percent sure" she wanted her husband dead."

‘$500 and he’s a ghost’: Man accused of enlisting white supremacists to kill his black neighbor
"A South Carolina man tried to enlist a white supremacist group to kill his black neighbor and burn a cross in that person’s front yard, authorities say.

Federal investigators say they learned of Brandon Cory Lecroy’s plan in March after a confidential informant told them that the 25-year-old had reached out to a white supremacist organization and said he needed help to kill his neighbor, a federal complaint says. The following day, March 20, an undercover FBI agent spoke with Lecroy, who offered payment for the job."



Amateur hour (with low quality amateurs):  Florida mom killed in case of mistaken identity in murder-for-hire love triangle

"Lopez-Ramos, 35, is accused of hiring Alexis Ramos-Rivera, 23, and his girlfriend Glorianmarie Quinones-Montes, 22, to murder the woman.

On Jan. 7 and the early morning hours of Jan. 8, the suspects planned the robbery and murder, and mistook Zengotita-Torres for their intended victim when she left a store at a shopping center Sunday night.

The suspects then followed her home, kidnapped her and forced her into her own car before driving away, Gibson said. They then made Zengotita-Torres give them her ATM card and pin number and used it to withdraw money, he said.

During the incident, Lopez-Ramos and Ramos-Rivera “realized that they had mistakenly taken the wrong person,” he said."
************

Doctor who ran a drug ring in collaboration with a motorcycle gang (and apparently succeeded in hiring a hitman from the gang)
Doctor accused of arranging wife’s killing to protect his drug ring is found dead in apparent suicide
"Kauffman, 68, of Linwood, a small town outside Atlantic City, was charged with first-degree murder this month, more than five years after his wife, local radio personality April Kauffman, was found dead inside their home. Ferdinand Augello, who prosecutors said was a co-conspirator, is also charged with first-degree murder.
...
"Prosecutors later outlined the prescription drug ring they said James Kauffman and Augello ran out of Kauffman’s office with the help of the Pagan Outlaw motorcycle gang.
...
"Augello was solicited by James Kauffman to kill his wife, and he found another man, Francis Mullholland, a cousin of a Pagan associate and a member of the drug enterprise, to do the deed, officials said.
...
"Prosecutors said they think Mullholland shot April Kauffman and was paid for the job.

"The drug enterprise, meanwhile, continued for years after the killing, until James Kauffman’s June arrest.

"Mullholland died after what officials say was an accidental overdose in 2013, NJ.com reported."
*************
Here's a case of successfully hiring a hitmen from former army colleagues:
Former Army Sniper, 2 Other Ex-Soldiers Accused of Becoming Hitmen
Published on Apr 3, 2018
"A former U.S. Army sniper and two other ex-soldiers have gone on trial in New York on charges they became contract killers for an international crime boss.

Assistant U.S. Attorney Patrick Eagan said in opening statements Tuesday that Joseph Hunter recruited the others for a cold-blooded hit on a real estate agent in the Philippines in 2012.

Defense attorneys said in their openings that evidence against them was too weak to convict them. All three have pleaded not guilty to murder conspiracy.

The case is expected to offer a window into the clandestine world of private mercenaries willing to kill for money. The trafficker has pleaded guilty and agreed to testify for the government."

More from the NY Times
New York Trial Will Explore the Secret World of Mercenary Soldiers
By ALAN FEUERAPRIL 2, 2018

"Joseph Hunter, 52, a former United States Army sergeant with Special Forces training, stands at the center of the trial, accused of planning the murder of the Filipino woman, Catherine Lee, while serving as the chief of security for a globe-trotting criminal named Paul Le Roux.

 

U.S. Reveals Criminal Boss’s Role in Capturing a Mercenary FEB. 1, 2015

In Real Life, ‘Rambo’ Ends Up as a Soldier of Misfortune, Behind Bars DEC. 20, 2014

By Benjamin Weiser May 31, 2016
"In late 2012, as part of the sting operation, Mr. Hunter began assembling a security team for what he had been led to believe were Colombian narcotics traffickers but were actually confidential sources working under the direction of the D.E.A., the government has said. "
*********

Here's a case of a woman jailed for trying to hire her handyman to kill her husband (the handyman turned her in) now trying to hire a fellow inmate to kill the handyman:
Woman accused of hiring hit men to get out of her hit-man-related troubles
By Alex Horton March 11  (Washington Post)

************
Here's the career of a prolific hitman, who seems to have been a contractor for rather than employee of drug cartels:
The Life Of One Of America’s Bloodiest Hitmen
https://www.buzzfeed.com/jessicagarrison/martinez-hitman-cartel-black-hand-mano-negra-contract-killer
***********
Here's the story of a successful amateur hit
Texas teen, girlfriend hired gunman to kill man's jeweler father, police say
"Nicholas Shaughnessy allegedly asked multiple people whether they would be willing to get paid to kill someone in the months before the shooting, investigators said. "
***********

There are scam sites that advertise hitmen:
https://allthingsvice.com/2016/05/14/the-curious-case-of-besa-mafia/
*********
And here's a parody site that got some serious looking inquiries and forwarded them to law enforcement: https://rentahitman.com/ 
*********
Here's a story of a "successful" murder, but the hitmen were caught...
A veteran pulled over to help a stuck truck. Its driver was a hit man hired to kill him. Washington Post, Sept 7, 2018, By Taylor Telford

"McFoley was a “thug of thugs,” Chitwood said, with a lengthy criminal record that showed his capacity for violence. After the road-rage incident, McFoley was charged with aggravated assault and unlawful possession of a firearm by a felon. He was slated to go to trial in early December 2017. To avoid going back to prison, Capt. Brian Henderson said, McFoley hired someone to take Cruz-Echevarria out.

"That’s where Benjamin Bascom came in. The 24-year-old had a reputation as a killer, Henderson said, adding that investigators have tied him to open murder cases in Orange County, Fla. Bascom and McFoley were “criminal associates,“ investigators said, and McFoley reached out over the phone, offering Bascom money to silence Cruz-Echevarria."
**********

Hit Men and Power: South Africa’s Leaders Are Killing One Another, NY Times, September 30, 2018, By Norimitsu Onishi and Selam Gebrekidan

"Political assassinations are rising sharply in South Africa, threatening the stability of hard-hit parts of the country and imperiling Mr. Mandela’s dream of a unified, democratic nation.

"But unlike much of the political violence that upended the country in the 1990s, the recent killings are not being driven by vicious battles between rival political parties.

"Quite the opposite: In most cases, A.N.C. officials are killing one another, hiring professional hit men to eliminate fellow party members in an all-or-nothing fight over money, turf and power, A.N.C. officials say."
*******

Polish diplomat admits ordering hit on wealthy mother of his partner
Wojciech Janowski confesses to being behind killing of billionaire after years of denial
At a 2018 trial in France for a 2014 hit. There are 10 defendents, including the two accused hitmen and an intermediary.
*********
July 2019 Atlantic Magazine
People Who Pay People to Kill People
*********
The trial of the alleged Dan Markel gunman and bag woman begins.
************
Guardian, Oct 22, 2019
The five reluctant hitmen of China: group jailed over botched contract killing
Court hears job was outsourced repeatedly before fifth hitman offered to stage the death and pocket the payment

200万雇凶杀人层层转包后成10万!“杀手”与被害人演戏……判了!
GT: "2 million hired murderers will be subcontracted into 100,000! The "killer" acted with the victim... sentenced!"

someone was trying to buy a hit for 2 million yuan, but after a chain of brokers, the killer only got paid for 100k. And the killer eventually thought it was not worth it and didn't carry out the crime. It is interesting that in the end, the original buyer was sentenced for the longest time, and the sentence decreased going down the chain. You may be able to read it yourself if you use google translate: https://zhuanlan.zhihu.com/p/87651845

********
Washington Post Jan 22, 2020
Zookeeper who killed tigers and tried to have rival murdered is sentenced to 22 years in prison
"An Oklahoma City jury found him guilty of twice trying to hire hit men to kill the activist.
One of the men Maldonado-Passage tried to commission was an undercover agent for the FBI...
***********

2 Attorneys Arrested In Alleged Murder For Hire Plot
They're accused of hiring an undercover police officer to kill another attorney.
**********

Ex-Lesotho PM paid gang to murder his wife, police say
Thomas Thabane and his current wife allegedly agreed to pay hitmen $179,485 to carry out killing
https://www.theguardian.com/world/2020/jun/11/ex-lesotho-pm-paid-gang-to-his-wife-police-say-thomas-thabane
**********

Washington Post, Feb. 2, 2021

A Louisiana man hired hit men to kill a woman accusing him of rape, police said. Instead, they allegedly killed his sister.    By Andrea Salcedo

***********

NY Times, Feb 5, 2021

N.Y.P.D. Officer Accused in Plot to Kill Husband Will Plead Guilty

**********

Washington Post, Feb 9, 2021

Journalists thwarted a murder-for-hire plot while reporting a story, prosecutors say

**********

People: (March 18, 2021): https://people.com/crime/father-ambushed-shot-9-times-knew-ex-wife-sent-hit-man/ 

***********

Washington Post May 10, 2021 :

A paroled murderer called himself a ‘good dude’ — before hiring a hit man to kill an ex, feds say  By 

Jaclyn Peiser

"Three months after he was released from prison on parole, Derrick D. Jackson parked his tan sedan on a residential street in Detroit and met with a man he hoped could solve a problem for him — Jackson wanted his ex-girlfriend dead, according to an affidavit.

“I just want head shots, just quick,” Jackson told the man, court documents said.

"Jackson, a convicted murderer, was looking for revenge on the woman, who lived in Ohio, claiming she stole money and drugs from him.

"He didn’t know it at the time, but the man Jackson was arranging to pay $11,000 for a murder-for-hire was an undercover special agent from the Bureau of Alcohol, Tobacco, Firearms and Explosives.

"And the agent was wearing a wire."

***********

From Alex Chan:

There is this one newspaper article:

https://washingtoncitypaper.com/article/208854/straight-dope-how-many-people-get-killed-for-money-each/

that used some extrapolations with violations of "chapter 18, section 1958 of the U.S. code" (The "murder-for-hire" statute, 18 U.S.C. § 1958, was enacted as part of the Comprehensive Crime Control Act of 1984) and claimed that there are approximately 416 hits done by hitman in the US.

and an analysis of online/dark web ads: https://cina.gmu.edu/wp-content/uploads/2020/07/An-Assessment-of-Hitmen-and-Contracted-Violence-Providers-Operating-Online.pdf

Seems like there is a NYTIMES pieces commenting on it (this paper) too:

https://www.nytimes.com/2020/03/04/technology/can-you-hire-a-hit-man-online.html

***************

A Michigan woman tried to hire an assassin online at RentAHitman.com. Now, she’s going to prison. By Jonathan Edwards, Washington Post,  November 22, 2021  

*****************

At Last, Girlfriend in House of Gucci Murder Drama Speaks Out. Sheree McLaughlin had a years-long affair with Maurizio Gucci, which gave him the courage to leave his marriage with Patrizia Reggiani. It was a decision that would get him killed.

"The story of Maurizio Gucci and his untimely death is infamous in Italy—and will soon be viewed by audiences around the world as it’s retold by director Ridley Scott in the film House of Gucci. Adam Driver plays Maurizio, and Lady Gaga portrays Patrizia, the glamorous wife who was eventually convicted of paying a hit man to have him killed. 

...

"Maurizio had been killed by a hit man as he walked up the steps of his office building in Milan. Two years later, Patrizia was arrested for hiring the killer, after a tipster went to the police. Judge Renato Samek, when issuing her sentence in November 1998 after a five-month trial, said that Maurizio had died not for who he was but for what he had: a formidable patrimony and an internationally recognized name. “Patrizia Reggiani did not intend to give these up,” said Samek, looking out over the courtroom. She was sentenced to 26 years in prison and released on parole after 18 years."

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If you got this far, you might also be interested in listening to this podcast:

Friday, February 4, 2022

Wednesday, February 2, 2022

Forbidden Transactions and Black Markets

 Here's a paper that was just published early online. (Only now do I see that I left out the middle initial I always use, but I'm one of the coauthors...)  

The idea of the paper is to understand when a repugnant transaction can be effectively banned, versus when a ban will lack sufficient social support to succeed. We present a simple to state (but tricky to analyze) model of conditions in which banning a market is likely to lead to a difficult to extinguish black market.

Two prominent examples are narcotic drugs (big black market) and hired killers (not so much, at least in the U.S.).  So we could have called the paper Heroin and Hitmen. (Hitmen were little more than a metaphor in this paper, but I expect to say a bit more about the actual market for hitmen in tomorrow's post.)

 Chenlin Gu, Alvin Roth, Qingyun Wu (2022) Forbidden Transactions and Black Markets. Mathematics of Operations Research  Published online in Articles in Advance 28 Jan 2022  . https://doi.org/10.1287/moor.2021.1236  (It's an open access article, so you can read the full paper: here's the pdf.)

 Abstract: "Repugnant transactions are sometimes banned, but legal bans sometimes give rise to active black markets that are difficult if not impossible to extinguish. We explore a model in which the probability of extinguishing a black market depends on the extent to which its transactions are regarded as repugnant, as measured by the proportion of the population that disapproves of them, and the intensity of that repugnance, as measured by willingness to punish. Sufficiently repugnant markets can be extinguished with even mild punishments, while others are insufficiently repugnant for this, and become exponentially more difficult to extinguish the larger they become, and the longer they survive."

Here are the first two paragraphs of the introduction:

"Why are drug dealers plentiful but hitmen scarce? That is, why is it relatively easy for a newcomer to the market to buy illegal drugs but hard to hire a killer? Both of those transactions come with harsh criminal penalties, vigorously enforced: in the United States, almost half of federal prisoners have drug convictions,1 and murder for hire2 is treated as a federal crime for both the buyer and the hitman.3

More generally, many transactions are repugnant, in the specific sense that they meet two criteria: some people want to engage in them, and others think that they should not be allowed to do so (Roth [48]). But only some repugnances become enacted into laws that criminalize those transactions, and only some of those banned markets give rise to active, illegal black markets. Only some of those black markets are so active yet so difficult to suppress that the laws banning them are eventually changed so as to allow the transactions that cannot be suppressed to be regulated. Laws that exact harsh punishments but are ineffective at curbing the transactions that they punish may come to be seen as causing harm themselves. Some well-known examples include Prohibition era laws against selling alcohol in the United States or laws in much of the world that once banned homosexual sex (and, in some places, still do)."


Tuesday, February 1, 2022

Shortages of blood, and breast milk

 The pandemic is putting strains on many supply chains, including those for donated (unpaid) medical supplies like blood and breast milk.  The pandemic is impacting both potential donors, and the ability of blood banks and milk banks to staff drives for additional supplies.

Here's a statement from the American Red Cross:

Red Cross: National blood crisis may put patients at risk

"The American Red Cross is facing a national blood crisis – its worst blood shortage in more than a decade. Dangerously low blood supply levels are posing a concerning risk to patient care and forcing doctors to make difficult decisions about who receives blood transfusions and who will need to wait until more products become available.

"Blood and platelet donations are critically needed to help prevent further delays in vital medical treatments, and donors of all blood types – especially type O − are urged to make an appointment now to give in the weeks ahead.

"In recent weeks, the Red Cross had less than a one-day supply of critical blood types and has had to limit blood product distributions to hospitals. At times, as much as one-quarter of hospital blood needs are not being met.

"Pandemic challenges

"The Red Cross continues to confront relentless challenges due to COVID-19, including about a 10% overall decline in the number of people donating blood as well as ongoing blood drive cancellations and staffing limitations. Additionally, the pandemic has contributed to a 62% drop in blood drives at schools and colleges.

************

Here's a story on breast milk from the Guardian:

‘Now, now, now. We need help now’: US warning over breast milk shortage as donations plunge. Demand for breast milk has surged during the pandemic, but supply from milk banks has fallen as people head back to work.  by Melody Schreiber

"“​​Demand has been surging in hospitals, primarily,” said Lindsay Groff, the executive director for the Human Milk Banking Association of North America (HMBANA). “At the same time, supply has dipped.”

"At all 31 milk banks in the US and Canada associated with HMBANA, milk donations are declining, down as much as 20% in some places.

"Milk bank directors say they’re not at a crisis point yet, but they will be if shortages continue.

“There’s no need to panic,” Groff said. But if “you feel compelled to help someone [by donating breast milk] – now is the time. Now, now, now, we need help now.”

"Donated breast milk can help medically fragile infants – those that are “too small and too soon and too sick”, as Kim Updegrove, executive director of Mothers’ Milk Bank at Austin, puts it – to overcome a range of potentially devastating conditions, from prematurity complications to heart and stomach problems. Necrotizing enterocolitis, an inflammation of the intestines, is a leading cause of death for premature babies, but breast milk can help prevent it.

...

" the pandemic has increased the need for donor milk. Studies have shown that contracting Covid-19 during pregnancy when you’re not vaccinated increases the chance of having a premature baby, who might then benefit from donor milk. Parents who become very ill from Covid are often unable to care for their babies or to pump milk for them.

Monday, January 31, 2022

Icknomics: Would more corneas be transplanted if they were called "ocular donations" instead of "eye donations"?

 Here's an article in the Journal of Medical Ethics about framing and language associated with the deceased donation of eye tissue.

Arguments for ‘ocular donation’ as standardised terminology to reduce the ‘ick factor’ of ‘eye donation’ by Katrina A Bramstedt  http://orcid.org/0000-0001-5446-0123, 

Abstract: This brief report presents the global problem of the shortfall of donor corneal tissue for transplantation, a potential root cause (‘ick factor’ language), and a potential solution (modification of ‘ick factor’ language). Specifically, use of the term ‘eye donation’ is a potential hurdle to ocular tissue donation as it can stimulate the ‘ick factor.’ Verbiage such as ‘ocular (eye tissue)’ could be a method of providing terminology that is less emotive than ‘eye donor’ or ‘eye donation.’ The field of transplantation has experienced terminology shifts over time; for example, ‘cadaver’ has been replaced with ‘deceased donor,’ ‘harvest’ has been replaced with ‘recover,’ and ‘life support’ has been replaced with ‘ventilated.’ Notably, only a small number of regions worldwide are using ‘ocular’ terminology, yet it could be an important step to enhancing the informed consent process and improving donation rates, potentially increasing transplant and optimising patient quality of life for those with treatable blindness."

"While corneal transplants are the most common transplants worldwide, corneal blindness remains a significant health problem due to the lack of donor corneal tissue. Globally, there is only 1 cornea available for 70 that are needed, leaving nearly 13 million patients awaiting transplant.1 In 45% of countries which provide corneal tissue donation services, the system requires explicit consent from the donor and/or their family (opt-in).1 Several studies worldwide have reported high rates of consent refusal2 3 with concern about the ‘ick factor’ (repulsion/disgust response) of ‘eye donation.’2 4

...

"the field of transplantation has experienced terminology shifts over time; for example, ‘cadaver’ has been replaced with ‘deceased donor,’ ‘harvest’ has been replaced with ‘recover,’ and ‘life support’ has been replaced with ‘ventilated.’11 ‘Ocular’ (of the eyes or vision) is a concise term that could be used for both eye tissue and whole eyes..."

Sunday, January 30, 2022

Chemistry is replacing agriculture in the supply of black market drugs

 The war on drugs is getting more complicated, as chemistry replaces agriculture as a primary source.  This calls for changes in both law enforcement and harm reduction.

Here's a balanced view from the WSJ:

The Once and Future Drug War. During the 50 years the U.S. has battled the narcotics trade, illegal drugs have become more available and potent. But that’s no reason to give up. Governments must adapt and find answers beyond law enforcement  By James Marson, Julie Wernau  and David Luhnow 

"America’s longest war isn’t the 20-year fight in Afghanistan. That struggle is dwarfed by the War on Drugs, started by President Richard Nixon more than 50 years ago and still raging.

"The drug war—which has relied on both law enforcement and the military, at a cost of untold lives and hundreds of billions of dollars—has fared little better than the Afghan campaign. Since Nixon’s declaration of war in 1971, drug use has soared in the U.S. and globally, the range and potency of available drugs has expanded and the power of criminal narcotics gangs has exploded.

...

"The global spread of synthetic drugs like methamphetamine, fentanyl and synthetic opioids is complicating interdiction—the core of America’s strategy for 50 years.

...

"Fentanyl has now killed far more Americans than all U.S. conflicts since World War II combined. In the past decade, it has claimed more than a half million lives, a toll that is growing swiftly. The nation was reporting fewer than 50,000 fatal overdoses as recently as 2014. 

...

"The Biden administration is the first to name “harm reduction” a priority. The White House Office on National Drug Control Policy, which was often run in the past by former generals and law-enforcement officials, is now led, for the first time, by a physician, Dr. Rahul Gupta.

...

"Europe is also pursuing harm reduction. The U.K., the Netherlands, Austria and others have offered drug testing, often at music events, to reduce the risk of overdosing or poisoning. Switzerland, the U.K., Germany and the Netherlands prescribe heroin to dependent users to cut fatal overdoses and needle sharing.

"Portugal has gone further. It decriminalized all drugs in 2001 amid a surge in heroin use and drug-dependent prisoners. Anyone caught with less than a 10-day supply of any drug is sent to a local commission that includes a doctor, lawyer and social worker for treatment. Overdose deaths have fallen from about 360 a year to 63 in 2019.

...

"Growing social and legal tolerance of drugs dismays people like Mike Vigil, who had a 31-year career in the DEA, including chief of international operations. He acknowledges that interdiction and law enforcement have not solved the problem. But he says that the U.S. has failed to develop a comprehensive strategy, including investing in down-and-out communities where drug use flourishes and trying to reduce future demand through massive, sustained education programs.

...

“We aren’t going to be able to arrest our way out of this,” says Mr. Vigil. His frustration is widely shared. “The U.S. has never taken the demand side of things seriously,” says former Mexican President Felipe Calderón."

Saturday, January 29, 2022

Erotic movies versus porn -- times and terms are changing

In a 1964 case, Jacobellis v. Ohio, Supreme Court Justice  Potter Stewart famously declared that it was difficult to define pornography, but that "I know it when I see it " (Less well known is how he continued that sentence: "I know it when I see it, and the motion picture involved in this case is not that.”

But "porn" has now become such a big category that it isn't even clear that the word retains its original repugnance.  A New York Times story that considers its redeeming features is about a film director whose website characterizes her this way: "Female provocateur and porn film director Erika Lust is creating a new world of indie adult cinema" (It turns out that Lust isn't her original family name...)

 Here's the story from the NY Times:

‘There’s Not Just One Type of Porn’: Erika Lust’s Alternative Vision. The Swedish moviemaker thinks pornography can create a society that sees sexuality as myriad and joyful, and where women’s pleasure matters.  By Mary Katharine Tramontana

*******

And here's another story, which features the megasite Pornhub, in Vanity Fair:

XXX-Files: Who Torched the Pornhub Palace?  BY ADAM GOLLNER

"Pornhub, with its undulating ocean of explicit content, is often ranked among the 10 most viewed websites in the world. More Americans use it than use Twitter, Netflix, or Instagram.

...

"starting in December, a series of legal and P.R. scandals slammed the company. First, a New York Times exposé accused the firm of knowingly hosting child sex abuse materials (CSAM). Antoon denied the charges: “Any suggestion that we allow or encourage illegal content is completely untrue and defies rational reason, from both a moral and business standpoint,” he told me. Still, Canadian senators and MPs called for a criminal investigation. In the uproar, credit card processors suspended payments on the site.

...

"Forty years ago, debates about porn focused on the idea that the sex industry was inherently dehumanizing and rife with abuse. Activist Andrea Dworkin famously argued that porn was detrimental to women, full stop. But not all second-wave feminists agreed. A vocal faction argued for an erotic-positive approach to rejecting sexual repression. The phrase “pornography is violence against women,” wrote Ellen Willis, an influential pro-sex feminist, “was code for the neo-Victorian idea that men want sex and women endure it.”

"The argument remains as contentious as it is unresolved. This fall, the Times published an op-ed by Michelle Goldberg—“Why Sex-Positive Feminism Is Falling Out of Fashion”—citing a TikTok-based “Cancel Porn” movement. Then again, Cosmo contended that “As we all know, women enjoy porn just as much as guys do.” In fact, an estimated one third of Pornhub’s users are women. And the current feminist perspective on the porn debate might best be summarized by Oxford philosopher Amia Srinivasan in her new book, The Right to Sex: Feminism in the 21st Century: “If a woman says she enjoys working in porn, or being paid to have sex with men, or engaging in rape fantasies, or wearing stilettos—and even that she doesn’t just enjoy these things but finds them emancipatory, part of her feminist praxis—then we are required, many feminists think, to trust her. 

...

"The most seismic attack on the company came a year ago—in the form of a Nicholas Kristof New York Times op-ed stating that Pornhub was “infested with rape videos. 

...

"Soon, a merry-go-round of lawsuits started being filed on behalf of underage or nonconsenting victims: an Alabama case invoked the Trafficking Victims Protection Reauthorization Act

...

"When Pornhub released an app last summer directing museumgoers to classic nude paintings, legal action was threatened by the Louvre and the Uffizi. As one Montreal source put it: “They’re in trouble all over the world.”

...

"The new crusaders aim to outlaw the commercial sex industry altogether, regardless of how that might affect sex workers, already a marginalized group. The main outcome of credit card bans on Pornhub—which Mickelwait considers an important victory—was that content creators stopped getting paid. The fallout extended to OnlyFans, the booming subscription-based platform that connects users directly with content creators. In August, OnlyFans threatened to remove all “sexually explicit” content, which would have had a chilling effect on free speech, open expression, and private digital commerce. Under pressure, the company reversed that decision

...

"While the internet continues its Wild West resistance to law and order, porn keeps getting ever more mainstream. (When Facebook and Instagram both went down one day last fall, for instance, Pornhub saw a 10.5 percent traffic spike.) Meanwhile, making porn has become America’s “side hustle,” Ruby told me, describing an expanding movement of makers selling their sexuality online. “People figured out that they could just document that part of their lives and earn an extra two or three thousand dollars a month and feed their families.” Pornhub, OnlyFans, and other digital portals played an integral part in that phenomenon."

Friday, January 28, 2022

Kidnapping and ransom in Nigeria

 Paying ransom is a repugnant transaction that looks different ex ante and ex post.  In Nigeria, where kidnapping is rampant, the government's view is increasingly that ransom payments should be prohibited, to make kidnapping unprofitable.  But after family members have been kidnapped, families are reluctant to let them be murdered, and are consequently eager to negotiate a ransom.

The WSJ has the story

A Kidnapping Negotiator Gets His Biggest Test: Saving His Own Wife. Abdullahi Tumburkai volunteers to help bargain with kidnappers in what has become a crisis of abductions in Nigeria.  By Joe Parkinson 

"Mr. Tumburkai estimates he has helped free more than 80 people across Nigeria’s northwest over the past year, in what has become one of the world’s worst kidnapping crises. Kidnapping for ransom has become a brutally profitable business across the country by heavily armed criminal gangs exploiting the government’s weak security presence. Gangs abducted an estimated tens of thousands of Nigerians in 2021, including more than 1,200 children seized from their schools.
...
"If they don’t haggle a ransom the victims can afford, hostages could be killed. If they succeed, these brokers make themselves a target among those who oppose any negotiations with kidnappers. The work embodies a moral argument that divides governments across the world: Should you pay to secure the return of hostages?

"Nigeria’s government and many community leaders say freelancers like Mr. Tumburkai are making the problem worse by creating a pathway for payments that finance terrorism and encouraging more kidnappings.

"Garba Shehu, Nigeria’s presidential spokesman, said that negotiating with kidnappers was “totally unacceptable” and that the government frowns at ransom payments. “It’s the responsibility of the police to advise persons whose relatives were kidnapped on what to do,” he said.
...
"On Wednesday, Nigeria’s attorney general said the groups responsible for the kidnappings would be formally listed as terrorists, and as a result anyone negotiating with kidnappers could be charged with financing terror groups."

Thursday, January 27, 2022

A brief history of deceased organ donation in one career--Howard Nathan retires

Organ donation and transplantation is still new enough that significant parts of its history can have been experienced in one career.  The WSJ reports on Howard Nathan's retirement from the Gift of Life Organ Procurement Organization, which he joined in 1978:

Howard Nathan Spent Decades ‘On Call’ for Organ Transplants. The CEO of the Gift of Life Donor Program is stepping down after a long career connecting organ donors with patients in need.  By Emily Bobrow

"When Mr. Nathan, 68, first joined the nonprofit that would become Gift of Life, he was one of three employees. Working around the clock, he traveled to hospitals in Pennsylvania, Delaware and New Jersey for hard conversations with grieving families and then made calls to surgeons in the hope of matching a donated organ with a waiting patient. “We would be driving on the Turnpike with a kidney in the car at three in the morning,” Mr. Nathan recalls on a video call from Gift of Life headquarters in central Philadelphia. “In the early days we had to make it up as we went along.”

"In 1994 he helped to draft Pennsylvania’s landmark organ donation law, which mandated that hospitals call organ-procurement organizations whenever a patient died. “Hospitals used to call when they wanted to. We were like Maytag repairmen waiting by the phone,” Mr. Nathan remembers. The law, which included funds for public-awareness campaigns and gave people a chance to register as organ donors when getting or renewing a driver’s license, increased donations by 43% in three years, he says. It became the model for a federal law in 1998.

...

"Brain death was a fairly new concept when Mr. Nathan first worked as an organ-donation coordinator—a job held by maybe 200 people around the country at the time. “We really had to teach and train people in the medical and legal aspects of donation,” he says.

...

"When Mr. Nathan entered the field, the success rate for transplants hovered at 30-35%. With the discovery in the early 1980s of immunosuppressant drugs, which curb the body’s natural rejection of foreign body parts, success rates have climbed above 90%."


HT: Frank McCormick

Wednesday, January 26, 2022

Matching and market design in the January issue of Theoretical Economics

 The current issue has three papers on the market design of matching markets.

Theoretical Economics, Volume 17, Number 1 (January 2022): Table of Contents

Here are the market design articles that caught my eye:

Rank-optimal assignments in uniform markets  by Afshin Nikzad

"We prove that in a market where agents rank objects independently and uniformly at random, there exists an assignment of objects to agents with a constant average rank (i.e., an average rank independent of the market size). The proof builds on techniques from random graph theory and the FKG inequality (Fortuin et al. (1971)). When the agents’ rankings are their private information, no Dominant Strategy Incentive Compatible mechanism can implement the assignment with the smallest average rank; however, we show that there exists a Bayesian Incentive Compatible mechanism that does so. Together with the fact that the average rank under the Random Serial Dictatorship (RSD) mechanism grows infinitely large with the market size, our findings indicate that the average rank under RSD can take a heavy toll compared to the first-best, and highlight the possibility of using other assignment methods in scenarios where average rank is a relevant objective.

*******

Family ties: school assignment with siblings by Umut Dur, Thayer Morrill, and William Phan

"We introduce a generalization of the school choice problem motivated by the following observations: students are assigned to grades within schools, many students have siblings who are applying as well, and school districts commonly guarantee that siblings will attend the same school. This last condition disqualifies the standard approach of considering grades independently as it may separate siblings. We argue that the central criterion in school choice—elimination of justified envy—is now inadequate as it does not consider siblings. We propose a new solution concept, suitability, that addresses this concern, and we introduce a new family of strategy-proof mechanisms where each satisfies it. Using data from the Wake County magnet school assignment, we demonstrate the impact on families of our proposed mechanism versus the “naive” assignment where sibling constraints are not taken into account."

**********

Optimal organ allocation policy under blood-type barriers with the donor-priority rule by Jaehong Kim and Mengling Li

"Shortages in organs for transplantation have resulted in a renewed interest in designing incentive policies to promote organ supply. The donor-priority rule, which grants priority for transplantation based on deceased organ donor registration status, has proven to be effective in both theory and practice. This study investigates the implications of the donor-priority rule for optimal deceased organ allocation policy design under a general formulation of blood-type barriers. We find that for any blood typing and organ matching technology, reserving type X organs for only type X patients maximizes the aggregate donation rate under regular distributions, which also ensures equity in organ sharing. Moreover, this is the unique optimal allocation policy if and only if the directed compatibility graph that corresponds to a given organ matching technology is acyclic."

Tuesday, January 25, 2022

Multiple offer mechanisms in school choice, when information gathering is costly

 When it's costly to gather information needed to inform yourself about your own preferences, having a guaranteed offer in hand may justify the effort to gather necessary information.  Here's a paper that considers that as a first order issue:

The Case for Dynamic Multi-offer Mechanisms, by Julien Grenet YingHua He Dorothea Kübler

January 2022, (Forthcoming: The Journal of Political Economy)

Abstract: We document quasi-experimental evidence against the common assumption in the matching literature that agents have full information on their own preferences. In Germany’s university admissions, the first stages of the Gale-Shapley algorithm are implemented in real time, allowing for multiple offers per student. We demonstrate that non-exploding early offers are accepted more often than later offers, despite not being more desirable. These results, together with survey evidence and a theoretical model, are consistent with students’ costly discovery of preferences. A novel dynamic multi-offer mechanism that batches early offers improves matching efficiency by informing students of offer availability before preference discovery.

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Update: the paper appears as

Grenet, Julien, YingHua He, and Dorothea Kübler. "Preference Discovery in University Admissions: The Case for Dynamic Multi-offer Mechanisms." Journal of Political Economy, volume 130, number 6, June 2022, 1427-1476,  https://www.journals.uchicago.edu/doi/epdf/10.1086/718983