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| | A Note on the Call-Put Parity and a Call-Put Duality |
 | | Along with the well-known "call--put parity" relation that makes it possible to express the rational price of a put option in terms of the rational price of a call option, we introduce a "call--put duality" relation. |
 | | This new concept offers a simple explanation of the relationship between the rational price of a put option and a call option, not only for options of the European type, but also for options of the American type. |
 | | call--put parity, Black--Merton--Scholes model, call--put duality, American call--put option, European call--put option, optimal stopping problem, free-boundary problem |
| epubs.siam.org /sam-bin/dbq/article/97884 (154 words) |
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