In the late 1940s, Milton Friedman was considered an important economist who had made significant technical contributions. At the beginning of the 1950s, however, he moved away from Keynesian economics and as a result was increasingly viewed as a bit of a nut. Two decades later, however, Friedman had become far and away the most important macroeconomist in the world. Much of the ongoing macro debate revolved around economists addressing Friedman's ideas, pro or con. How did this happen? Edward...