The 2008 financial crisis—like the Great Depression—was a world-historical event. What caused it will be debated for years, if not generations. The conventional narrative is that the financial crisis was caused by Wall Street greed and insufficient regulation of the financial system. That narrative produced the Dodd-Frank Act, the mostcomprehensive financial-system regulation since the New Deal. There is evidence, however, that the Dodd-Frank Act has slowed the recovery from...