The Risk of Immunity Passes

I argued earlier that if we have Immunity Passes they Must Be Combined With Variolation because “the demand to go back to work may be so strong that some people will want to become deliberately infected. If not done carefully, however, these people will be a threat to others, especially in their asymptomatic phase.” Thus, if we have immunity passes we must also have controlled infection.

In a new paper, Daniel Hemel and Anup Malani run the numbers and verify the intuition:

…Our topline result is that strategic self-infection would be privately rational for younger adults under a wide range of plausible parameters. This result raises two significant concerns. First, in the process of infecting themselves, younger adults may expose others—including older and/or immunocompromised individuals—to SARS-CoV-2, generating significant negative externalities. Second, even if younger adults can self-infect without exposing others to risk, large numbers of self-infections over a short timeframe after introduction of the immunity passport regime may impose significant congestion externalities on health care infrastructure. We then evaluate several interventions that could mitigate moral hazard under an immunity passport regime, including the extension of unemployment benefits, staggered implementation of passports, and controlled exposure of individuals who seek to self-infect. Our results underscore the importance of careful planning around moral hazard as part of any widescale immunity passport regime.


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