Ten years ago this week, Lehman Brothers filed for bankruptcy, and the world suddenly changed. That date, Sept. 15, 2008, was hardly the starting point of the Depression-sized financial crisis that would soon threaten to sink the entire world economy; it had begun more than a year earlier. But most scholars agree Lehman’s failure marked the moment when everyone realized at once that the so-called experts had no idea how deep the interconnections ran.

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