Abstract
When the demand for a medical resource exceeds the supply, we have a problem of scarcity. There are many instantiations of this issue. The time of health care providers during an emergency, organs for transplantation, a bed in an intensive care unit, and a slot in a research protocol can all be scarce resources. Interest in this issue has been renewed because of recent concerns about a pandemic and shortages of vaccines. In each of these cases there is a problem of distributive justice. If the resource is lifesaving, then the question is especially poignant: Who shall be saved when not all can be? This was the problem faced by Sir Dr. Colenso Ridgeon in Bernard Shaw's 'The Doctor's Dilemma', a play first performed a century ago.