Among economists, business leaders, and others, the debate continues over what George Mason University’s Tyler Cowen calls “The Great Stagnation”  of the U.S. economy — and what interventions might return it to growth. Cowen points to the fact that wage levels in America have plateaued. He argues more broadly that all the “low-hanging fruit” produced by some non-repeatable breakthroughs (including fundamental technological triumphs) has been plucked. Going forward, we’ll have to work harder for any gains in productivity and prosperity, and they will come slower.