What do we know about the effects of payments to participants in challenge trials for vaccines, and other public spirited activities?

There is starting to be an empirical literature associated with payments for socially productive activities, such as participating in challenge trials of vaccines, donating plasma, etc.

Here's a blog post in the Medical Ethics blog of the Journal of Medical Ethics:

Is it acceptable to pay nothing or little to challenge trial participants?  By Sandro Ambuehl, Axel Ockenfels and Alvin E Roth.   October 30, 2020

Here's a paragraph (with some links).:

"we hope that the debates about payments in medical research, and on other transactions subject to restrictions on payments such as blood plasma donations, will converge as empirical results accumulate. To date, there is empirical evidence on the underlying motivations for volunteering, on the impact of high payment on human risk taking, on decision quality and well-being, on the signal value of small payments, on strategies to evade regulation, and on the general public’s assessment of appropriate activities and  payments. Moreover, there are studies that document biases affecting normative judgment in general, and biases affecting paternalistic restrictions and moral intuitions in particular.

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This blog post was written in connection with our paper in the JME:

Payment in challenge studies from an economics perspective 

by Sandro Ambuehl, Axel Ockenfels, and Alvin E. Roth

published online early, Oct 28, 2020. http://dx.doi.org/10.1136/medethics-2020-