Though the populist tide seems to have ebbed, it will rise again, and soon. The problem that ignited populist sentiment in the first place, whether on the left or the right, remains: the country’s economic and financial system has failed much of the population and is rigged to the benefit of a government-business elite. Resistance to this inequity elevated Trump and pulled the Democratic Party to the left and will continue to roil American politics until things change. The economy’s “rigging” has developed gradually over time and often from the best of intentions. When politicians, corporate executives, pundits, journalists, academics...