We build a model of the financial sector to explain why adverse asset shocks in good economic times lead to a sudden drying up of liquidity. Financial firms raise short-term debt in order to finance asset purchases. When asset fundamentals worsen, debt induces firms to risk-shift; this limits...

The concentration of risk within the financial system leads to systemic instability. We propose a theory to explain the structure of the financial system and show how it alters the risk taking incentives of financial institutions when the government optimally intervenes during crises. By issuing...