Abstract
Abstract The aim of this paper is to (1) propose specific diagonal-free measures of the inefficiency of information flow through social networks and (2) present an analysis of the structural determinants of inefficiency. We employ a formal model of collective action developed by Coleman (1973, 1990); link it to the Markov model of interpersonal influence developed by among others French (1956), Harary (1959), and Friedkin (1991; Friedkin and Johnsen 1990); and extend it to measure inefficiency in information flow based on the concept of mean first passage times. It is shown that structural characteristics of social networks — such as global density, local density, diameter, number of bridges, and inequality in centrality, and certain interactions among these variables — strongly affect inefficiency. Theoretical implications of the results are discussed.
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