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Three hours a day is quite enough,” wrote John Maynard Keynes in his 1930 essay Economic Possibilities for our Grandchildren. The essay continues to tantalise its readers today, thanks in part to a forecast that is looking magnificently right — that in advanced economies people could be up to eight times better off in 2030 than in 1930 — coupled with a forecast that is looking spectacularly wrong, that we would be working 15-hour weeks. 约翰•梅纳德•凯恩斯(John Maynard Keynes)曾在1930年的一篇短文《我们子孙后代的经济可能性》(Economic Possibilities for our Grandchildren)中写道：“每天3小时就足够了。”这篇短文现在仍吸引着读者，部分原因是一项看上去极其正确的预测：到2030年，发达经济体国民的富裕程度可能会达到1930年的8倍，还有一项看上去极其错误的预测：我们将每周工作15小时。 In 2008, economists Lorenzo Pecchi and Gustavo Piga edited a book in which celebrated economists pondered Keynes’s essay. One contributor, Benjamin Friedman of Harvard University, has recently revisited the question of what Keynes got wrong, and produced a thought-provoking answer. 2008年，经济学家洛伦佐•佩基(Lorenzo Pecchi)和古斯塔沃•皮加(Gustavo Piga)编辑了一本书，在书中，一些知名经济学家对凯恩斯的这篇短文进行了探讨。撰稿人之一、哈佛大学(Harvard University)教授本杰明•弗里德曼(Benjamin Friedman)最近重新提到了凯恩斯预测错的那个问题，并提出了一个发人深省的答案。 | 
