FOR most of human history rich people had the most leisure. In “Downton Abbey”, a drama about the British upper classes of the early 20th century, one aloof aristocrat has never heard of the term “weekend”: for her, every day is filled with leisure. On the flip side, the poor have typically slogged. Hans-Joachim Voth, an economic historian at the University of Zurich, shows that in 1800 the averag
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