Abstract: Over the last decade, research topics such as learning, heterogeneity, networks, diffusion, and externalities, have moved from the fringe to the frontier in the social sciences. In large part this new research agenda has been driven by key tools and ideas emerging from the study of complex adaptive systems. Research is often inspired by simple models that provide a rich domain from which to explore the world. Indeed, in complex systems, Bak’s (1996) sand pile, Arthur’s (1994) El Farol bar, and Kauffman’s (1989) NK system have provided suc...
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