On the evaluation of European continuous-istallment options
This paper is concerned with the valuation of European continuous-installment options where the aim is to determine the initial premium given a constant installment payment plan. The distinctive feature of this pricing problem is the determination, along with the initial premium, of an optimal stopping boundary since the option holder has the right to stop making installment payments at any time before maturity. Given that the initial premium function of this option is governed by an inhomogeneous Black-Scholes partial di erential equation, we can obtain two alternative characterizations of the European continuous-installment option pricing problem, for which no closed-form solution is available. Firstly, we formulate the pricing problem as a free boundary problem and using the integral representation method we derive integral expressions for both the initial premium and the optimal stopping boundary. Secondly, we use the linear complementarity formulation of the pricing problem for determining the initial premium and the early stopping curve implicitly with a finite di erence scheme. Finally, the pricing problem is posed as an optimal stopping problem and then implemented by a Monte Carlo approach
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