RT Journal Article SR Electronic T1 Pricing Discretely Monitored Barrier Options by a Markov Chain JF The Journal of Derivatives FD Institutional Investor Journals SP 9 OP 31 DO 10.3905/jod.2003.319203 VO 10 IS 4 A1 Jin-Chuan Duan A1 Evan Dudley A1 Geneviève Gauthier A1 Jean-Guy Simonato YR 2003 UL https://pm-research.com/content/10/4/9.abstract AB Barrier options have become commonplace in the option market, and a variety of other financial contracts may also be thought of in terms of barrier options. But the existence of a price barrier can significantly complicate the option valuation problem when volatility is time-varying, or the barrier itself moves over time, or the barrier is only monitored at discrete intervals. In this article, Duan et al. present a new Markov chain technology for pricing barrier options that readily handles all of these problems. Out-and-in options can be valued within their framework even when volatility follows a GARCH process and a discretely monitored time-varying barrier is present.