This paper investigates the role of investment reversibility in determining the relationship between product market competition and equity risk premium. We develop a unified real-option framework involving corporate investment and disinvestment decisions in a continuous-time Cournot–Nash equilibrium. The effect of competition on a firm’s risk premium induced by contraction options is negative and similar to that on the risk premium induced by expansion options; however, for assets in place, more competition results in a higher risk premium by increasing operating leverage. Notably, investment reversibility rather than product market demand moderates the competition-risk premium relationship. Our model predicts that the equity risk premium is more negatively correlated with the level of competition if investments are more reversible because firms are more likely to adjust their capacity in response to uncertain demand and this flexibility attenuates the positive operating leverage effect. We find robust empirical evidence to support our theoretical prediction.

In this study, we explore the impact of the establishment of environmental courts, an environmental justice system, on the cost of equity capital. Based on a quasi-natural experiment of establishing environmental courts in China, we find that they have a deterrent effect and reduce the cost of equity capital for heavily polluting firms in localities. We also find that a low proportion of managerial ownership, a low level of analyst attention, and high environmental uncertainty induce this deterrent effect. Furthermore, mechanism tests indicate that environmental courts enhance corporate environmental engagement and corporate ESG ratings, increase long-term institutional investor ownership, and reduce urban environmental violations to achieve a deterrent effect. The findings are more pronounced for the trial court sample, firms in cities with lower public participation in environmental protection, and firms with lower environmental information transparency. We also suggest the impacts and underlying mechanisms of the environmental justice system on the equity capital market, which is conducive to long-term planning by firm managers.