English, Article edition: A NEW ANALYTICAL APPROXIMATION FORMULA FOR THE OPTIMAL EXERCISE BOUNDARY OF AMERICAN PUT OPTIONS SONG-PING ZHU

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Bookmark: http://trove.nla.gov.au/version/83368
Physical Description
  • article
Language
  • English

Edition details

Title
  • A NEW ANALYTICAL APPROXIMATION FORMULA FOR THE OPTIMAL EXERCISE BOUNDARY OF AMERICAN PUT OPTIONS
Author
  • SONG-PING ZHU
Physical Description
  • article
Notes
  • In this paper, a new analytical formula as an approximation to the value of American put options and their optimal exercise boundary is presented. A transform is first introduced to better deal with the terminal condition and, most importantly, the optimal exercise price which is an unknown moving boundary and the key reason that valuing American options is much harder than valuing its European counterparts. The pseudo-steady-state approximation is then used in the performance of the Laplace transform, to convert the systems of partial differential equations to systems of ordinary differential equations in the Laplace space. A simple and elegant formula is found for the optimal exercise boundary as well as the option price of the American put with constant interest rate and volatility. Other hedge parameters as the derivatives of this solution are also presented.
  • American put options, Laplace, transform, moving boundary value problems
  • RePEc:wsi:ijtafx:v:09:y:2006:i:07:p:1141-1177
Language
  • English
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