Cash and carry  

In a fun piece on traffic jams, Michael Kinsley makes this suave argument in an aside about what it would mean to have a kidney market:

Should a rich person who needs a kidney replacement be allowed to buy one from a healthy poor person? The answer of all the advanced democracies is: no. Human kidneys should not be part of the dollar economy. A rich person shouldn't be able to get one of yours just because he has more money. But outlawing this deal doesn't thwart just the rich person. It thwarts the poor one too. He thinks he'd be better off with the cash than with the second kidney. We think it's terrible that he has to make that choice, but we're not offering a third alternative. We're just forcing him to take what he thinks is the worst of the current two.