O'Brien faults my account of classical monetary theory for two reasons. First, my model, in his view, applies only to long-run equilibrium, whereas the classical monetary theorists were concerned mostly with short-run monetary control. Second, my model improperly assumes that the law of one price holds continuously when, in fact, it holds, if at all, only in the long run. This assumption leads to the notion that convertibility entails a uniform international price level. Together, these assumptions "produce an account of classical monetary theory" that is "hard to recognize" (O'Brien 1995, 51).