Much of the conventional wisdom stems from Friedman’s (1968a; 1968b) informal discussions and Cagan’s (1972) reduced-form evidence on how nominal interest rates respond to a permanent change in money growth. According to that wisdom, the interest rate response is broken into a “short-run,” a “medium-run,” and a “long-run” response. In the short run, when wages, prices, and portfolios do not adj...