Option Prices as Probabilities

Option Prices as Probabilities
Author :
Publisher : Springer Science & Business Media
Total Pages : 282
Release :
ISBN-10 : 9783642103957
ISBN-13 : 3642103952
Rating : 4/5 (952 Downloads)

Book Synopsis Option Prices as Probabilities by : Christophe Profeta

Download or read book Option Prices as Probabilities written by Christophe Profeta and published by Springer Science & Business Media. This book was released on 2010-01-26 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discovered in the seventies, Black-Scholes formula continues to play a central role in Mathematical Finance. We recall this formula. Let (B ,t? 0; F ,t? 0, P) - t t note a standard Brownian motion with B = 0, (F ,t? 0) being its natural ?ltra- 0 t t tion. Let E := exp B? ,t? 0 denote the exponential martingale associated t t 2 to (B ,t? 0). This martingale, also called geometric Brownian motion, is a model t to describe the evolution of prices of a risky asset. Let, for every K? 0: + ? (t) :=E (K?E ) (0.1) K t and + C (t) :=E (E?K) (0.2) K t denote respectively the price of a European put, resp. of a European call, associated with this martingale. Let N be the cumulative distribution function of a reduced Gaussian variable: x 2 y 1 ? 2 ? N (x) := e dy. (0.3) 2? ?? The celebrated Black-Scholes formula gives an explicit expression of? (t) and K C (t) in terms ofN : K ? ? log(K) t log(K) t ? (t)= KN ? + ?N ? ? (0.4) K t 2 t 2 and ? ?


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