Template-Type:ReDIF-Paper 1.0 Title:Stock Price Fluctuation as a Diffusion in a Random Environment Author-Name:Föllmer, Hans Classification-JEL:G10, D52, D84 Keywords:asset prices, temporary equilibria, noise traders, random environment, hedging, probabilistic cellur automata Abstract:The fluctuation of stock prices is modelled as a sequence of temporary equilibria on a financial market with different types of agents. We summarize joint work with M. Schweizer on the class of Ornstein-Uhlenbeck processes in a random environment which appears in the diffusion limit. Moreover, we show how the random environment may be generated by the interaction of a large set of agents modelled by Markov chains as they appear in the theory of probabilistic cellular automata. Length: pages Creation-Date: 1993-12 Revision-Date: Handle: RePEc:bon:bonsfb:264