Lol, because capitalism continues to go through its boom-and-bust cycle it has "innate vigor" ... even though the crests of the cycle are getting shallower and farther apart, and the troughs are getting deeper and closer together. Actually it seems unemployment has grown recently and growth is lower than previously projected among other troubling indicators. But the U.S. is in the middle of a bit of an upswing, partly as a result of capitalism's normal boom and bust cycle, and partly because U.S. capitalists have increased their competitiveness by being more successful than their European rivals at 1) devaluing their own currency and 2) getting the labor force to work harder for less money.