Abstract
This paper develops a general model for equity volatility when the firm is financed by equity, debt and any other financial instruments like warrants and convertible bonds. The stochastic nature of equity volatility is endogenous and comes from the impact of a change in the value of the firm’s assets on the financial leverage. We first present the basic model to value corporate securities, which is an extension of the Black-Scholes model. Then, we are able to propose an analytic approximation for equity volatility, which is shown to be extremely precise. Finally, we study the behaviour of equity volatility when the firm is financed by equity and debt.
Subject
Pharmacology (medical),Complementary and alternative medicine,Pharmaceutical Science
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