具有货币中心结构的银行网络模型研究

Research on Bank Network Models with Money-center Structures

为解释现实银行系统中存在的货币中心结构形成机制,本文基于对银行资产负债表和银行同业拆借机制刻画,构建了银行网络动态演化模型。通过仿真分析,研究发现:构建的银行网络模型具有货币中心结构特征,资产规模大的银行是货币中心银行,但货币中心银行的地位随时间是在演变的;流动性短缺银行以低利率策略进行同业拆借,而资产规模大的银行往往以低利率来吸引流动性短缺银行;基于合并周期的银行网络密度具有较强的稳定性;银行资产和同业拆借规模的互补累计分布函数服从对数正态分布。

In order to explain the formation mechanism of money-center structures in the real banking system,this paper constructs a dynamic evolution model of bank networks based on the description of bank balance sheets and the interbank lending mechanism. Through the simulation analysis,it is found that the constructed model of bank networks has the characteristics of money-center structures; banks with large-scale assets are money-center banks,but the status of money-center banks is evolving over time; banks with short liquidity borrow money from other banks through low interest rate strategy,and banks with large-scale assets tend to attract banks with short liquidity through low interest rates; the bank network density based on the combined data has a strong stability; complementary cumulative distribution functions of bank assets and inter-bank lending follow a lognormal distribution respectively.