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What accounts for the waves of policy diffusion that increasingly sweep across regions of the world? Why do many diverse countries adopt similar changes? Focusing on the spread of Chilean-style pension privatization in Latin America, this article assesses the relative merit of four theoretical explanations that scholars of diffusion have proposed. As the principal mechanism driving innovations' spread, these approaches emphasize external pressures, emanating especially from international financial institutions; the quest for symbolic or normative legitimacy; rational learning and cost-benefit calculation; and cognitive heuristics, respectively. The article assesses which one of these frameworks can best account for the three distinctive features of diffusion, namely its wavelike temporal pattern; its geographical clustering; and the spread of similarity amid diversity. While several approaches contribute to understanding policy diffusion, the analysis suggests that the cognitive-psychological framework offers a particularly persuasive account of the spread of pension reform.

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Prominent scholars have highlighted important similarities between the Arab Spring of 2011 and the “revolutions” of 1848: Both waves of contention swept with dramatic speed across whole regions, but ended up yielding rather limited advances toward political liberalism and democracy. I seek to uncover the causal mechanisms that help account for these striking parallels. Drawing on my recent analysis of 1848, I argue that contention spread so quickly because many people in a wide range of countries drew rash inferences from the downfall of Tunisia's dictator. Applying cognitive heuristics that psychologists have documented, they overrated the significance of the Tunisian success, overestimated the similarities with the political situation in their own country, and jumped to the conclusion that they could successfully challenge their own autocrats. This precipitation prompted protests in many settings that actually were much less propitious; therefore problems abounded. Cognitive shortcuts held such sway because Arab societies were weakly organized and repressed and thus lacked leaders from whom common people could take authoritative cues. The decision whether to engage in emulative contention fell to ordinary citizens, who—due to limited information access and scarce experience—were especially susceptible to the simple inferences suggested by cognitive heuristics.

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