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http://www.startribune.com/lifestyle/health/62423862.html?elr=KArksLckD8EQDUoaEyqyP4O:DW3ckUiD3aPc:_Yyc:aUUsZ
Kidney exchanges use the oldest economic model of all - trade. Computer matching can start a chain of transplants, but the idea has a long way to go.
By Josephine Marcotty, Star Tribune

Melissa Larson sat outside a Minneapolis coffee shop staring at the brochure her doctor had just handed her. ...
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The idea still faces daunting hurdles. It needs buy-in from more of the nation's 220 transplant hospitals, a broader set of widely accepted medical guidelines for living donors, and financial support from Medicare and other health plans. But with that support, exchanges have the potential to create a national matching system. That could save millions of dollars in the cost of treating kidney disease and end the ordeal of thousands of desperate kidney patients. (Including Melissa Larson. 課文沒有這句 接後面PAGE裡的下一段)

Such kidney exchanges are brand new, but they rely on the oldest economic model of all -- trade. Your wife gets a compatible kidney from a stranger, you give a compatible kidney to the stranger's sister. Two perfect matches -- or four or 10 or 100 -- are made by a computer that chooses the best medical and geographic combinations.

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No one expects exchange pools to eliminate the deceased kidney waiting list. But some predict they could increase the number of transplants by up to 4,000 per year - the same number of people who die each year while waiting on the list.