This graphic (HT to Chartporn) is telling in a couple of ways. On the surface, it would seem to reinforce the idea that firms move to other countries to save on wages. (But as is sometimes said "if wage was the whole story, Bangladesh and Ethiopia would be the industrial capitals of the world.")
But the true value of the graphic is in the follow-up questions. If so many countries have a wage advantage, why does organized labor often support a higher minimum wage? And why do many firms stay in the U.S.?
The answers may lie in the concept of productivity and/or self-interest. I'd be interested in your thoughts.