US crime levels have fallen to their lowest reported levels in nearly half a century despite major unemployment and the worst economic downturn since the Great Depression. Even more remarkably, the drop was steepest in America’s big cities – which are still popularly believed to be cauldrons of criminality. The question is: why?
虽然美国正面临着严重的失业问题和大萧条(Great Depression)以来最严峻的manbetx20客户端下载 下滑，但它的犯罪率现在却降至近半个世纪以来有报告的最低水平。更加值得注意的是，虽然美国大城市仍被普遍认为是犯罪的温床，但那里的犯罪率下降却最为明显。原因何在？
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