Why do presidential candidates touting their concern for the economy pose with factory workers rather than with ballet troupes? After all, the U.S. now has more choreographers (16,340) than metal-casters (14,880), according to the Bureau of Labor Statistics. More people make their livings shuffling and dealing cards in casinos (82,960) than running lathes (65,840), and there are almost three times as many security guards (1,004,130) as machinists (385,690). Whereas 30 percent of Americans worked in manufacturing in 1950, fewer than 15 percent do now. The economy as politicians present it is a folkloric thing.