Postrel deals with "donor chains" in which people who want to give a kidney, but are incompatible with their target, form chains with other incompatible donors to get everyone what they want. Then she moves onto markets, which are very controversial. I confess, I don't understand the ban on paying for organs. We let eighteen year olds decide to go to Iraq in order to eventually pay for college, but we won't let a thirty-five year old sell off a part of himself that he probably won't need, and with which he could save a life?
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