I like France. The language is beautiful. The food is inspiring. And I appreciate topless beaches as much as the next guy. Still, I sometimes wonder if eating snails doesn't somehow dull one's ability to make sensible economic policy. I promised that this column, I would debunk one of the most pernicious economic ideas of the left. (In my last column, I skewered one from the right: See "Debunking One of the Worst Ideas in Economics".) I've chosen the "lump of labor" fallacy, which is the mistaken notion that the world has a fixed number of jobs and that therefore...