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The multiplex dependency structure of financial markets

Nicoló Musmeci, Vincenzo Nicosia, Tomaso Aste, Tiziana Di Matteo and Vito Latora

LSE Research Online Documents on Economics from London School of Economics and Political Science, LSE Library

Abstract: We propose here a multiplex network approach to investigate simultaneously different types of dependency in complex datasets. In particular, we consider multiplex networks made of four layers corresponding, respectively, to linear, nonlinear, tail, and partial correlations among a set of financial time series. We construct the sparse graph on each layer using a standard network filtering procedure, and we then analyse the structural properties of the obtained multiplex networks. The study of the time evolution of the multiplex constructed from financial data uncovers important changes in intrinsically multiplex properties of the network, and such changes are associated with periods of financial stress. We observe that some features are unique to the multiplex structure and would not be visible otherwise by the separate analysis of the single-layer networks corresponding to each dependency measure.

JEL-codes: F3 G3 (search for similar items in EconPapers)
Date: 2017-09-20
New Economics Papers: this item is included in nep-fmk and nep-rmg
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Published in Complexity, 20, September, 2017, 2017, pp. 1-13. ISSN: 1076-2787

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