| 正文 | We analyze the emergence of systemic risk in a network model of interconnected bank balance sheets.The model incorporates multiple sources of systemic risk, including size of financial institutions, directexposure from interbank lendings, and asset fire sales. We suggest a new macroprudential risk manage-ment approach building on a system wide value at risk (SVaR). Under the SVaR metric, the contributionof individual banks to systemic risk is well defined and can be approximated by a Shapley value-typemeasure. We show that, in a SVaR regime, a fair systemic risk charge which is proportional to a bank’sindividual contribution to systemic risk diverges from the optimal macroprudential capitalization of thebanks from a planner’s perspective. The results have implications for the design of macroprudential capitalsurcharges. |
