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01-07-2015

Structural and non-structural temporal evolution of socio-economic real networks

Authors: Rosanna Grassi, Marco Fattore, Alberto Arcagni

Published in: Quality & Quantity | Issue 4/2015

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Abstract

In this paper, we show that a comprehensive analysis of temporal network evolution requires to consider measures of non-structural changes, in addition to classical topological indicators. We employ a recently proposed measure of non-structural dynamics, together with other structural indicators, to analyze the time evolution of three subnetworks, extracted from the Italian corporate board network. Consistently with recent literature, we show that, to different extent, both structural and non-structural changes are present and must be accounted for, in order to get a satisfactory description of their temporal evolution.

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We use the greek letter \(\delta \) since, in general, \(\delta ^{str}(\cdot , \cdot ) \) and \(\delta ^{shf}(\cdot ,\cdot )\) are not metrics.

RCS MediaGroup S.p.A. is an international multimedia publishing group operating in the editorial sector. It operates in daily newspapers, magazines and books, radio broadcasting, new media and digital and satellite TV, advertisement sales and distribution markets. Looking at the ownership, among the RCS shareholders there are some important listed italian companies from financial institutions, insurance and industrial sectors (Mediobanca S.p.A, Intesa Sanpaolo, Pirelli S.p.A, Fiat S.p.A, Assicurazioni Generali, Fondiaria Sai); thus, many important Italian families (Pesenti, Tronchetti-Provera, Ligresti and Agnelli) are present in RCS board.

Intesa Sanpaolo S.p.A is a banking group, born in 2007 by the merge of Banca Intesa and Sanpaolo IMI. Currently, it is the second largest Italian banking group, after Unicredit Group.

Fiat S.p.A. was founded in 1899 by Giovanni Agnelli, it is has been historically the largest non-State owned company in Italy. From 2007 to 2011 the company has always been controlled by Agnelli family (first by Ifil and from 2009 by Exor).

Two companies are indirectly tied when there is no edge between them, i.e. they are not adjacent but are connected by a path passing through other nodes.

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Title: Structural and non-structural temporal evolution of socio-economic real networks
Authors: Rosanna Grassi
Marco Fattore
Alberto Arcagni
Publication date: 01-07-2015
Publisher: Springer Netherlands
Published in: Quality & Quantity / Issue 4/2015
Print ISSN: 0033-5177
Electronic ISSN: 1573-7845
DOI: https://doi.org/10.1007/s11135-014-0070-3

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