The Consolation of Economic History

Brad Delong, the wise, writes:

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The current recession may turn into a small depression, and may push global living standards down by five percent for one or two or (we hope not) five years, but that does not erase the gulf between those of us in the globe's middle and upper classes and all human existence prior to the Industrial Revolution.
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The 18th Century British family could buy 17 copies of the Wealth of Nations out of its annual income. The American family in 2009 can buy 6,000 copies: a multiplication factor of 350.
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I'm convinced that everyone I know can easily imagine how to spend up to three times their current income usefully and productively. (It is only beyond three times your current spending that people judge others' spending as absurd and wasteful.) And everybody I know finds it very difficult to imagine how people can survive on less than one-third of what they spend—never mind that all of our pre-industrial ancestors did so all the time.