… there is a simple method to ensure that priority and equal treatment are met for rationed goods? Suppose there are half a million people living in cities A and B who should be vaccinated, but there are only a quarter of a million vaccine doses. There are 400,000 people living in A and 100,000 in B. In order for each city to vaccinate half of the highest priority people, 1/5 of the doses should be delivered to B and 4/5 of the doses should be delivered to A.
Carlos Alós-Ferrer, Jaume García-Segarra, Miguel Ginés-Vilar
Ethical allocation of scarce vaccine doses: The Priority-Equality protocol
Frontiers in Public Health 10:986776