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?
This article available online at:
http://www.theatlantic.com/business/archive/2009/07/the-gift-of-life/21269/