My wife is helping with a local drive to get people to register to donate organs. We thought that, as a cancer survivor, she herself would not be allowed to register. Wrong. Anyone under age 85 can register, so long as their cancer is not active and they do not have a systemic infection of any kind.
The doctor who informed us says this increases the potential supply of transplantable organs. If the demand is high enough, and the patients sick enough, the doctors will choose to use a donated organ even if the transplantation risk from the particular organ is substantial. Thus, while fortunately the price system is not used explicitly in the transplantable organ market, the choice to allow more people to register and to compare the demand to the increased supply suggests economics is currently present in this market.