Meeting Strangers and Friends of Friends: How Random Are Social Networks?
Jackson, Matthew O., and
Brian W. Rogers. 2007. "Meeting Strangers and Friends of Friends: How Random Are Social Networks?."
American Economic Review,
We present a dynamic model of network formation where nodes find other nodes
with whom to form links in two ways: some are found uniformly at random, while
others are found by searching locally through the current structure of the network
(e.g., meeting friends of friends). This combination of meeting processes results in
a spectrum of features exhibited by large social networks, including the presence of
more high- and low-degree nodes than when links are formed independently at
random, having low distances between nodes in the network, and having high
clustering of links on a local level. We fit the model to data from six networks and
impute the relative ratio of random to network-based meetings in link formation,
which turns out to vary dramatically across applications. We show that as the
random/network-based meeting ratio varies, the resulting degree distributions can
be ordered in the sense of stochastic dominance, which allows us to infer how the
formation process affects average utility in the network. (JEL D85, Z13)
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Jackson, Matthew O.
Rogers, Brian W.