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内容説明 The setting of this analysis is the discrete-time version of the Black-Scholes model， namely the Cox-Ross-Rubinstein model. The book gives a complete description of its background， which is now only the theory of finite stochastic processes. The novelty lies in the fact that orders of magnitude - in the sense of nonstandard analysis - are imposed on the parameters of the model. This not only makes the model more economically sound (such as rapid fluctuations of the market being represented by infinitesimal trading periods)， but also leads to a significant simplification: the fundamental results of Black-Scholes theory are derived in full generality and with mathematical rigour， now at graduate level. The material has been repeatedly taught in a third-year course to econometricians.