Economics theorists for years have considered the possibility that the direction of technical change is altered by changes in relative prices. Prices also have been identified as one of the determinants of technical change through innovation, This article extends the theory of the firm to cover situations in which the firms technology set is conditional on expected prices. The basic idea is to distinguish between market prices, or the prices that guide the firm\u27s choices subject to the technology that is in place, and normal prices, the prices conditioning the choice of technology. A “generalized price effect is obtained that includes the traditional price effect as well as the technical change effect of price changes, and an exampl...