Multi-stage real option evaluation with double barrier under stochastic volatility and interest rate

This paper focuses on valuing R&D projects using a two-fold compound real option by including two knock-out barriers. However, the valuation of R&D projects is not a simple task, since they are characterised by various risks and sequential decision-making. Specifically, we embed a double-barrier in the multi-stage real option in order to mitigate the risk of huge losses for the investor. In this way, our model incorporates the opportunity to abandon a project if its profitability falls below a benchmark level. We contribute to the existing literature in these ways: first we present a closed formula that allows evaluating this kind of project assuming the technical uncertainty of each research phase; secondly, we consider the scenario in which the volatility and the interest rate are both stochastic. Finally, we provide an application for a wind farm case.