What is systemic risk? : moral hazard, initial shocks and propagation

Abstract

This paper discusses different aspects of the notion of systemic risk. It contains a selective survey of the research on related topics, a review of some case studies of financial crises and failures, and a discussion pointing toward the importance of moral hazard as a key element of systemic risk. The main ideas studied are the links between capital structure theory and bank capital regulation, and moral hazard and agency theory at the level of the individual trader, the financial firm, and the overall financial system. Another important idea is the codetermination of asset prices and bank solvency. My main focus is on moral hazard as a potentially fruitful area for future research. Although existing research emphasizes the powerful propagation mechanisms whereby a small initial shock can be amplified by the financial system, I suggest that moral hazard, together with leverage at the level of the individual firm, can cause a large shock to the financial system.

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