Nier, Erlend; Yang, Jing; Yorulmazer, Tanju; Alentorn, Amadeo Network models and financial stability. (English) Zbl 1201.91245 J. Econ. Dyn. Control 31, No. 6, 2033-2060 (2007). Summary: Systemic risk is a key concern for central banks charged with safeguarding overall financial stability. In this paper we investigate how systemic risk is affected by the structure of the financial system. We construct banking systems that are composed of a number of banks that are connected by interbank linkages. We then vary the key parameters that define the structure of the financial system – including its level of capitalisation, the degree to which banks are connected, the size of interbank exposures and the degree of concentration of the system – and analyse the influence of these parameters on the likelihood of knock-on defaults. First, we find that the better capitalised banks are, the more resilient is the banking system against contagious defaults and this effect is non-linear. Second, the effect of the degree of connectivity is non-monotonic, i.e. initially a small increase in connectivity increases the contagion effect; but after a certain threshold value, connectivity improves the ability of a banking system to absorb shocks. Third, the size of interbank liabilities tends to increase the risk of knock-on default, even if banks hold capital against such exposures. Fourth, more concentrated banking systems are shown to be prone to larger systemic risk, all else equal. In an extension to the main analysis we study how liquidity effects interact with banking structure to produce a greater chance of systemic breakdown. We finally consider how the risk of contagion might depend on the degree of asymmetry (tiering) inherent in the structure of the banking system. A number of our results have important implications for public policy, which this paper also draws out. Cited in 2 ReviewsCited in 101 Documents MSC: 91G99 Actuarial science and mathematical finance 91B64 Macroeconomic theory (monetary models, models of taxation) Keywords:networks; financial stability; contagion; liquidity risk PDFBibTeX XMLCite \textit{E. Nier} et al., J. Econ. Dyn. Control 31, No. 6, 2033--2060 (2007; Zbl 1201.91245) Full Text: DOI References: [1] Acharya, V., Yorulmazer, T., 2007. Cash-in-the-market pricing and optimal bank bailout policy. Review of Financial Studies, forthcoming.; Acharya, V., Yorulmazer, T., 2007. Cash-in-the-market pricing and optimal bank bailout policy. Review of Financial Studies, forthcoming. [2] Allen, F., Gale, D., 1994. Limited market participation and volatility of asset prices. American Economic Review 84 (4), 933-955.; Allen, F., Gale, D., 1994. Limited market participation and volatility of asset prices. American Economic Review 84 (4), 933-955. [3] Allen, F., Gale, D., 1998. Optimal financial crises. 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