Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Ohio announced a Vax-a-Million Lottery in May 2021 to encourage people to get vaccinated. If people avoid vaccinations because they (1) worry about rare but critical side effects or (2) want to free-ride on herd immunity, the vaccination lottery may work better or worse than a lump-sum transfer to the contributors for herd immunity. I experimentally compare the effectiveness of the vaccination lottery with a lump-sum transfer. Overall, the vaccination lottery works better, and it especially incentivizes probability-weighting subjects.