Populism of the right and left has spread like wildfire throughout the world. The impulse reached its apogee in the United States with the election of Trump, but it was a force in Europe ever since the Great Recession sent the European economy into a prolonged tailspin. In the simplest terms, populism is a political ideology that vilifies economic and political elites and instead lionizes 'the people.' The people, populists of all stripes contend,...