An important new book substantiates something progressives have long intuited. Published first in Britain and now headed for the United States, it's by epidemiologist Richard Wilkinson and health researcher Kate Pickett, and its title conveys its message: The Spirit Level: Why More Equal Societies Almost Always Do Better.
Since the French Revolution, belief in the social benefits of egalitarianism has been central to progressive thought. Now Wilkinson and Pickett have produced some hard evidence for this plank in the liberal...
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