Diffusion and Contagion in Networks with Heterogeneous Agents and Homophily

Details Diffusion and Contagion in Networks with Heterogeneous Agents and Homophily Diffusion and Contagion in Networks with Heterogeneous Agents and Homophily

2011-10-31

arxiv.org/abs/1111.0073v1

Physics

Physics and Society

18 pages, 1 figure

Scientific paper

We study how a behavior (an idea, buying a product, having a disease, adopting a cultural fad or a technology) spreads among agents in an a social network that exhibits segregation or homophily (the tendency of agents to associate with others similar to themselves). Individuals are distinguished by their types (e.g., race, gender, age, wealth, religion, profession, etc.) which, together with biased interaction patterns, induce heterogeneous rates of adoption. We identify the conditions under which a behavior diffuses and becomes persistent in the population. These conditions relate to the level of homophily in a society, the underlying proclivities of various types for adoption or infection, as well as how each type interacts with its own type. In particular, we show that homophily can facilitate diffusion from a small initial seed of adopters.

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