What is the role of collateral and restructuring know how in a framework of debt renegotiation and a priori private information? We show that the result in the literature according to which debt renegotiation implies that the high-risk borrower is more inclined to pledge collateral than the...

In the standard CAPM with a riskless asset we give a simple proof of existence of equilibria without assuming concavity of the investor's utility functions. Moreover, we give a uniqueness result using assumptions on the risk aversion of investors.