"The same challenge—how to understand what had happened between the wars and prevent its recurrence—was confronted by John Maynard Keynes. The great English economist, born in 1883 (the same year as Schumpeter), grew up in a stable, confident, prosperous, and powerful Britain. And then, from his privileged perch at the Treasury and as a participant in the Versailles peace negotiations, he watched his world collapse, taking with it all the reassuring certainties of his culture and class. Keynes, too, would ask himself the question that Hayek and his Austrian colleagues had posed. But he offered a very different answer. Yes, Keynes acknowledged, the disintegration of late Victorian Europe was the defining experience of his lifetime. Indeed, the essence of his contributions to economic theory was his insistence upon uncertainty: in contrast to the confident nostrums of classical and neoclassical economics, Keynes would insist upon the essential unpredictability of human affairs. If there was a lesson to be drawn from depression, fascism, and war, it was this: uncertainty—elevated to the level of insecurity and collective fear—was the corrosive force that had threatened and might again threaten the liberal world."