Paul Krugman: Running Out of Planet to Exploit

Nine years ago The Economist ran a big story on oil, which was then selling for $10 a barrel. The magazine warned that this might not last. Instead, it suggested, oil might well fall to $5 a barrel.

In any case, The Economist asserted, the world faced “the prospect of cheap, plentiful oil for the foreseeable future.”

Last week, oil hit $117.

It’s not just oil that has defied the complacency of a few years back. Food prices have also soared, as have the prices of basic metals. And the global surge in commodity prices is reviving a question we haven’t heard much since the 1970s: Will limited supplies of natural resources pose an obstacle to future world economic growth?