nep-net New Economics Papers
on Network Economics
Issue of 2007‒05‒26
two papers chosen by
Yi-Nung Yang
Chung Yuan Christian University

  1. Unpacking social interactions By Ethan Cohen-Cole; Giulio Zanella
  2. Do Larger Firms Have More Interfirm Relationships? By SAITO (UMENO) Yukiko; WATANABE Tsutomu; IWAMURA Mitsuru

  1. By: Ethan Cohen-Cole; Giulio Zanella
    Abstract: As empirical work in identifying social effects becomes more prevalent, researchers are beginning to struggle with identifying the composition of social interactions within any given reference group. In this paper, we present a simple econometric methodology for the separate identification of multiple social interactions. The setting under which we achieve separation is special, but is likely to be appropriate in many applications.
    Keywords: Social choice
    Date: 2007
  2. By: SAITO (UMENO) Yukiko; WATANABE Tsutomu; IWAMURA Mitsuru
    Abstract: In this study, we investigate interfirm networks by employing a unique dataset containing information on more than 800,000 Japanese firms, about half of all corporate firms currently operating in Japan. First, we find that the number of relationships, measured by the indegree, has a fat-tail distribution, implying that there exist "hub" firms with a large number of relationships. Moreover, the indegree distribution for those hub firms also exhibits a fat tail, suggesting the existence of "super-hub" firms. Second, we find that larger firms tend to have more counterparts, but that the relationship between firms' size and the number of their counterparts is not necessarily proportional; firms that already have a large number of counterparts tend to grow without proportionately expanding it.
    Date: 2007–05

This nep-net issue is ©2007 by Yi-Nung Yang. It is provided as is without any express or implied warranty. It may be freely redistributed in whole or in part for any purpose. If distributed in part, please include this notice.
General information on the NEP project can be found at For comments please write to the director of NEP, Marco Novarese at <>. Put “NEP” in the subject, otherwise your mail may be rejected.
NEP’s infrastructure is sponsored by the School of Economics and Finance of Massey University in New Zealand.