In an incomplete market framework, contingent claims are of particular interest since they improve the market efficiency. This paper addresses the problem of market completeness when trading in contingent claims is allowed. We extend recent results by Bajeux and Rochet (1996) in a stochastic...

We study the critical price of an American put option near expiration in the Black-Scholes model. Our main result is an estimate for the difference &Pmacr; ("t")- "K" between the critical price at time "t" and the exercise price as "t" approaches the maturity of the option. Copyright 1995 Blackwell...