In school choice, the reason universal enrollment systems that give each child one assignment are so desirable is that if children are accepted by multiple schools, it often takes time (e.g. the first week of the school term) to sort out which children are going where, and to free up the unclaimed spaces.
The same thing is happening with decentralized appointments for Covid vaccines. The WSJ has the story:
Got Your Covid-19 Vaccine? Now Cancel Your Extra Appointments. Pharmacies and community clinics say uncanceled appointments lead to no-shows, adding to their already heavy workload By Jaewon Kang and Sharon Terlep
"Pharmacies and health officials are making a plea to Americans who received their Covid-19 vaccines: Cancel the other shots you booked.
"As vaccine eligibility expands and more places offer shots, many people are signing up for multiple appointments and not backing out of the ones they don’t need. The resulting influx of no-shows is forcing vaccine providers, from pharmacies to community clinics, to find last-minute replacements so doses aren’t wasted.
...
"Appointments remain tough to score in many parts of the country even though the overall supply of vaccines and the pace of inoculation are improving. Some people are making multiple bookings in hopes of getting vaccinated sooner or sometimes because they don’t receive or see confirmation emails, according to pharmacies and community vaccination sites. Others receive shots at pop-up vaccination events before scheduled appointments and don’t notify providers.
"The U.S. lacks a concrete system of tracking wasted doses. Generally, local and state officials say that demand is high enough that no-shows aren’t leading to tossed vaccines, though vaccine providers say they sometimes fail to find takers for all the doses they have thawed in time to use them all safely."
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