Our ongoing troubles with health care stem from an unwillingness to deal with certain facts. One of those facts is scarcity. “Scarcity” is a term from economics, and it refers to the fact that there is never enough of anything to satisfy every possible desire — the universe holds only so much, and human desire has a way of outgrowing whatever we have. So we have to come up with a way of dividing up that which is scarce. We have tried many different ways of doing that — war, caste systems, central planning — though mostly we’ve relied on the fact that everybody wants lots of different things, which makes it possible to trade. But buying and selling stuff is not, to be sure, the only way to divide up that which is scarce.

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