Collateral, heterogeneity in risk attitude and the credit market equilibrium

This paper examines the argument that the availability of collateral rules out credit rationing. A model of the credit market with ex-ante asymmetric information and heterogeneous entrepreneur's attitudes toward risk is set up. It is shown that, due to the interplay between project choice and entrepreneurs' preferences, using collateral as a signal to screen safer projects may prove impossible. Instead, a partially separating two-contract equilibrium with rationing at one contract emerges. Contrary to previous theoretical research and consistently with conventional wisdom and systematic evidence, the use of collateral is never negatively correlated with project risk.