"We had the great depression, we had two world wars, we had the flu epidemic. We had oil shock. We had all these terrible things happen. But something about the American system unleashed more and of a potential to human beings over that hundred years so that we had a seven for one improvement in - there's never been any - I mean, you have centuries where if you've got a 1 percent improvement, then it's something. So we've got a great system. And we've got more productive capacity now than we ever have."