Azéma martingales for Bessel and CIR processes and the pricing of Parisian zero-coupon bonds. (English) Zbl 1508.91554
Summary: In this paper, we study the excursions of Bessel and Cox-Ingersoll-Ross (CIR) processes with dimensions \(0<\delta <2\). We obtain densities for the last passage times and meanders of the processes. Using these results, we prove a variation of the Azéma martingale for the Bessel and CIR processes based on excursion theory. Furthermore, we study their Parisian excursions, and generalize previous results on the Parisian stopping time of Brownian motion to that of the Bessel and CIR processes. We obtain explicit formulas and asymptotic results for the densities of the Parisian stopping times, and develop exact simulation algorithms to sample the Parisian stopping times of Bessel and CIR processes. We introduce a new type of bond, the zero-coupon Parisian bond. The buyer of such a bond is betting against zero interest rates, while the seller is effectively hedging against a period where interest rates fluctuate around 0. Using our results, we propose two methods for pricing these bonds and provide numerical examples.
MSC:
| 91G20 | Derivative securities (option pricing, hedging, etc.) |
| 60G44 | Martingales with continuous parameter |
Keywords:
Azéma martingale; Bessel process; Cox-Ingersoll-Ross process; Monte Carlo simulation; Parisian stopping timeReferences:
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