《Fragmentation, integration and macroprudential surveillance of the US
financial industry: Insights from network science》
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作者:
Y\\\'erali Gandica, Marco Valerio Geraci, Sophie B\\\'ereau and Jean-Yves
Gnabo
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最新提交年份:
2018
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英文摘要:
Drawing on recent contributions inferring financial interconnectedness from market data, our paper provides new insights on the evolution of the US financial industry over a long period of time by using several tools coming from network science. Following [1] a Time-Varying Parameter Vector AutoRegressive (TVP-VAR) approach on stock market returns to retrieve unobserved directed links among financial institutions, we reconstruct a fully dynamic network in the sense that connections are let to evolve through time. The financial system analysed consists of a large set of $155$ financial institutions that are all the banks, broker-dealers, insurance and real estate companies listed in the Standard & Poor\'s $500$ index over the period $1993 - 2014$. Looking alternatively at the individual, then sector-, community- and system-wide levels, we show that network science\'s tools are able to support well known features of the financial markets such as the dramatic fall of connectivity following Lehman Brothers\' collapse. More importantly, by means of less traditional metrics, such as sectoral interface or measurements based on contagion processes, our results document the co-existence of both fragmentation and integration phases between firms independently from the sector they belong to, and in doing so, question the relevance of existing macroprudential surveillance frameworks which have been mostly developed on a sectoral basis. Overall, our results improve our understanding of the US financial landscape and may have important implications for risk monitoring as well as macroprudential policy design.
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中文摘要:
根据最近从市场数据推断金融互联性的贡献,我们的论文通过使用网络科学的几种工具,对美国金融业在很长一段时间内的演变提供了新的见解。根据[1]一种关于股票市场收益的时变参数向量自回归(TVP-VAR)方法来检索金融机构之间未观察到的有向联系,我们重建了一个完全动态的网络,即允许联系随时间演化。所分析的金融系统由一大批155美元的金融机构组成,这些金融机构都是1993年至2014年期间标准普尔500美元指数中列出的银行、经纪人、保险和房地产公司。或者从个人、然后是部门、社区和全系统层面来看,我们表明,网络科学的工具能够支持金融市场的众所周知的特征,例如雷曼兄弟倒闭后连通性的急剧下降。更重要的是,通过不太传统的指标,如部门接口或基于传染过程的测量,我们的结果记录了独立于所属部门的公司之间的分裂和整合阶段的共存,并在这样做的过程中,质疑主要在部门基础上制定的现有宏观审慎监管框架的相关性。总的来说,我们的研究结果提高了我们对美国金融形势的理解,并可能对风险监控和宏观审慎政策设计产生重要影响。
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分类信息:
一级分类:Physics 物理学
二级分类:Physics and Society 物理学与社会
分类描述:Structure, dynamics and collective behavior of societies and groups (human or otherwise). Quantitative analysis of social networks and other complex networks. Physics and engineering of infrastructure and systems of broad societal impact (e.g., energy grids, transportation networks).
社会和团体(人类或其他)的结构、动态和集体行为。社会网络和其他复杂网络的定量分析。具有广泛社会影响的基础设施和系统(如能源网、运输网络)的物理和工程。
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一级分类:Quantitative Finance 数量金融学
二级分类:General Finance 一般财务
分类描述:Development of general quantitative methodologies with applications in finance
通用定量方法的发展及其在金融中的应用
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