Economic inequality recently has entered the political discourse in a highly visible way. This political impact is not a surprise. As the U.S. economy has begun to recover from the Great Recession since mid-2009, economic growth has effectively been appropriated by those already well off,...

It was a part of the wisdom of mainstream economics that in the early stages of development inequality would rise but as growth persisted, it would, eventually, decline. Early evidence seemed to suggest that this pattern would be borne out. But, as time passed and growth persisted, inequality...