Study On The Effect Of Inter Bank Risk Contagion Under The Perspective Of Complex Network Structure

2013June outbreak of the banking industry "money" incident has fully exposed the existence of business of banks risk, risk to remind the regulatory authorities must face up to the trade business expansion. Once the individual or the part of the bank by the business risk evolved into crisis, if handled properly, may cause the entire banking system crisis, or even lead to financial crisis, influence on the economic development of countries or regions. Therefore, the risk of contagion is needed to cause the banking crisis research.From the domestic and foreign literatures, the use of complex network structure of inter bank risk contagion research has become a trend, but the scholars study on interbank credit risk contagion, often on the network of bank specific connection using a priori assumptions, is less about crisis bank lending assets to recover energy conduction the impact of liquidity on their counterparties generated. At present, also not in the general network structure of scholars, considering the crisis bank lending assets to recover the debt default and borrowing effect on bank system risk of infection. Therefore, complex network in this paper in the network connection mode relatively free, analyzes the impact of liquidity conduction balance sheet lending assets to recover the trigger and retail debt default triggered solvency conduction impact two routes of transmission, were studied in the single impact and system shock two state of sudden impact, the influence of the network structure and the behaviors of banks in the banking system changes to the risk of infection. Based on the discussion of the above research contents, this paper is divided into the following five parts.The first part is the introduction, mainly to do a preliminary introduction to the framework and the innovation and the deficiency of the research background, research significance, domestic and international theoretical research situation, research methods.The second part is to introduce the related theory of bank risk contagion. This part mainly analyzes the risk of transmission channels of contagion of banking risk definition, interbank market.The third part is the analysis of the process of bank risk contagion between. In this part of bank risk contagion between simple network structure description, as well as on bank balance sheets are analyzed, and makes a classification of the banks in which the state, risk contagion between banks on the process are analyzed, and then a brief simulation of the process of risk contagion.The fourth part is the use of Matlab software, the risk of infectious condition suffer unexpected shocks to the banking system after the market, were simulated, analyzed influence of single shock and systemic impact on the banking system.The fifth part is the conclusion and suggestion, various conclusions on risk contagion in the paper are summarized, and put forward relevant banking regulatory proposals.The conclusions are as follows:1In the interbank market, an increase in the number of banks in favor of risk contagion effect weakened banking system.2In the inter-bank market, enhance cooperation in all the banking system will reduce solvency risk contagion effect, but need to pay attention to the status of a large bank systemic risk occurs when.3In the single impact, enhance the degree of cooperation between banks reduce banking system liquidity risk.4Banks can through the regulation of its asset structure, reduce the impact on bank system risk contagion.5In the banking system solvency crisis situations, the risk of contagion solvency crisis will lead to a liquidity crisis contagion.According to the research, obtained the following suggestions:1Continue to promote the development of the interbank market, regulate market access, allowing reasonable expansion of the market scale of the inter-Bank members.2The members of the interbank market transactions should be moderate, not blind development. Between each bank in the network obeys power-law distribution of power law index between2.05～2.5relative.3With the current development of China’s Bank interbank market the paper research background description of the need of larger commercial banks focus on liability positions.4On different size of bank concentration should be classified management. Suggestions are divided into two aspects:(1) focus on the national joint-stock banks in the interbank market the counterparty for the account of its net assets of the institutions lending total other financial institutions and small bank borrowing accounted for the proportion, the liquidity ratio of these two indicators.(2) to set a maximum limit interbank lending the proportion of small banks, and focus on the credit and lending assets small banks accounted for credit borrowing assets net assets ratio and small banks accounted for the proportion of the two liquidity supervision index.