The Value of Early Exercise in Option Prices: An Empirical Investigation

Terry L. Zivney

Journal of Financial and Quantitative Analysis, 1991, vol. 26, issue 1, 129-138

Abstract: Previous studies in the valuation of American options apparently undervalue the right of early exercise. This study uses actual prices from the CBOE's S&P 100 option instead of model-generated values. Deviations from the theoretical put-call parity relationship are caused by the possibility of early exercise. These deviations are used to infer the value of early exercise. The actual value of early exercise is both statistically and economically significant. As expected from theoretical considerations, the value of early exercise for put options is greater than for call options.

Date: 1991
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