In 1931 distinguished economist John Maynard Keynes published a short essay, "Economic Possibilities for Our Grandchildren," in his collection Essays in Persuasion. In the essay, he expressed optimism for the economic future despite the doldrums of the post-World War I years and the onset of the Great Depression. Keynes imagined that by 2030 the standard of living would be dramatically higher; people, liberated from want (and without the desire to consume for the sake of consumption), would work no more than fifteen hours a week, devoting the rest of their time to leisure and...