We propose a simple model to study the efficiency of private liquidity creation by financial intermediaries. Liquidity is provided by both safe and risky debt, and liquidity crises arise when risky debt is defaulted on and stops providing liquidity services. Because of a novel externality...

A dynamic model of consumption and portfolio decisions is analyzed in which agents seek robust choices against some misspecification of the model probability distribution. This near-rational environment can at the same time explain an imperfect international portfolio diversification and break...