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Theory Probab. Appl. 39, pp. 61-102 (42 pages)

Toward the Theory of Pricing of Options of Both European and American Types. II. Continuous Time

A. N. Shiryaev, Yu. M. Kabanov, D. O. Kramkov, and A. V. Mel’nikov

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In the first part of the paper [29] the options pricing theory was developed under the assumption that a $(B,S)$-market is discrete (in space and in time). It is assumed in the present text that a $(B,S)$-market is operating continuously in time. The riskless bank account$B = (B_t )_{t \geqq 0} $ is evolving according to the “compound interests” formula (1.1), and a risky stock price $S = (S_t )_{t \geqq 0} $ is governed by geometric Brownian motion (1.4).
The “martingale” pricing theory is presented for fair (rational) option price, hedging strategies, and rational expiration times. The Black-Scholes formula for a standard European call option is derived. The paper considers a number of other particular examples of European as well as American options.

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