But if long hours aren't the secret to rapid growth and high employment, the reverse does appear to be true. As countries get richer, their citizens work less: Since the mid-20th century, average annual working hours have declined across the Western world. In the United States, however, the decline has been less dramatic.
So maybe it's time for you Yanks to relax a bit more. Take a full week off for Thanksgiving (as opposed to trying to sneak off on a Wednesday afternoon), or do like the French and take August off next year. It'll make the country healthier, happier — and maybe one day even as rich as Canada.
Kenny is senior fellow at the Center for Global Development, Schwartz fellow at the New America Foundation, and author, most recently, of "Getting Better."