We develop a model of optimal capital structure in imperfectly competitive markets by focusing on a duopoly. The model endogenizes both the financing and investment decisions of firms. We show that in equilibrium the industry leader uses debt conservatively, while the follower uses debt more aggressively and, as the result, defaults first. The model generates novel predictions about the leverage choices of the leader and the follower, their default likelihood, and the degree of leverage dispersion between competing firms. These predictions are strongly supported by the data. (JEL G13, G34, L13)

This paper shows that the stock market misprices firms’ investment options. We build a real options model of optimal investment under uncertainty to estimate the value of firms’ investment options. We show that firms with valuable investment options have a higher likelihood of being mispriced. Importantly, this mispricing is not one-sided, as such firms are equally likely to be undervalued or overvalued. Our paper adds to the debate on whether public equity markets are myopic and systematically undervalue innovative firms. We show that this is not necessarily the case.