"In the long run the facts win out. The fanatical simplicities perish in the Darwinian struggle for survival of useful principle. To illustrate this, listen to what I used to say to one of my generation's leading economists (a warm friend with a strong ideology that differed considerably from my own eclectic value judgments and methodology): You are a brilliant scholar, dazzlingly creative, with clear-cut economic convictions. But for you, things are either simply absurd or absurdly simple. Indeed the good fairies gave you every gift save one—the invaluable gift of "maybe.""