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The Hidden Side of Everything
From 1991 to 2001, violent crime in the US fell more than 30 percent. Stephen Dubner: Why was it that crime after rising for 30 years from 1960 and 1990, it suddenly reversed? Freakonomics co-author Steve Levett wrote a paper called Understanding Why Crime Fell in the 1990s. He found four factors that explain the decline and six that do not.