Nearly eighty years ago, John Maynard Keynes did the math on economic growth and concluded that within a few generations—by the time his peers' great-grandchildren came of age in, say, the 2000's—the persistent economic problem of too-scarce resources and too-few goods would no longer bedevil a substantial portion of humanity. He was right—even in the midst of our current hard times, he is right.
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. We have reached the frontier of mass material comfort—where we have enough food that we are not painfully hungry, enough clothing that we are not shiveringly cold, enough shelter that we are not distressingly wet, even enough entertainment that we are not bored. We—at least those lucky enough to be in the global middle and upper classes who still cluster around the North Atlantic—have lots and lots of stuff. Our machines and factories have given us the power to get more and more stuff by getting more and more stuff—a self-perpetuating cycle of consumption.
Our goods are not only plentiful but cheap. I am a book addict. Yet even I am fighting hard to spend as great a share of my income on books as Adam Smith did in his day. Back on March 9, 1776 Adam Smith's Inquiry into the Nature and Causes of the Wealth of Nations went on sale for the price of 1.8 pounds sterling at a time when the median family made perhaps 30 pounds a year. That one book (admittedly a big book and an expensive one) cost six percent of the median family's annual income. In the United States today, median family income is $50,000 a year and Smith's Wealth of Nations costs $7.95 at Amazon (in the Bantam Classics edition). 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.
Keynes was right about growth, despite predating the Solow growth model by a quarter-century. Some of his speculations about the social and cultural change that would follow in the wake of the end of scarcity have not panned out (so far, at least). DeLong believes we will never run out of things that we want:
Keynes thought that by today we would have reached a realm of plenty where "We shall once more value ends above means and prefer the good to the useful. We shall honour those who can teach us how to pluck the hour and the day virtuously and well, the delightful people who are capable of taking direct enjoyment in things, the lilies of the field who toil not, neither do they spin."
But no dice. I look around, and all I can say is: not yet, not for a long time to come, and perhaps never. 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. There is a point at which we say "enough!" to more oat porridge. But all evidence suggests Keynes was wrong: We are simply not built to ever say "enough!" to stuff in general.
In the Times, a while back, Bob Frank came to a similar conclusion.