According to Keynes, the nineteenth century had unleashed such a torrent of technological innovation—“electricity, petrol, steel, rubber, cotton, the chemical industries, automatic machinery and the methods of mass production”—that further growth was inevitable. The size of the global economy, he forecast, would increase sevenfold in the following century, and this, in concert with ever greater “technical improvements,” would usher in the fifteen-hour week. To Keynes, the coming age of abundance, while welcome, would pose a new and in some ways even bigger challenge. With so little need for labor, people would have to figure out what to do with themselves: “For the first time since his creation man will be faced with his real, his permanent problem—how to use his freedom from pressing economic cares, how to occupy the leisure, which science and compound interest will have won.” The example offered by the idle rich was, he observed, “very depressing”; most of them had “failed disastrously” to find satisfying pastimes.
via http://www.newyorker.com/magazine/2014/05/26/no-time