Homonymous projections

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Why do liberals drink lattes? How lifestyles tied to political views can be self-reinforcing among partisan groups

The increasing polarization of U.S. politics has seen the rise of partisan ‘echo chambers’ with little interaction between those at opposite poles. This division has broadened to include lifestyles, with liberals often characterized as ‘latte-drinking’ and conservatives as ‘gun enthusiasts’, for example. In new research, Daniel DellaPosta, Yongren Shi, and Michael Macy look at how political ideology becomes linked to people’s lifestyles. They show how demographic influences on opinions can be amplified by the self-reinforcing dynamics of peer group interactions

Roots of Trumpism: Homophily and Social Feedback in Donald Trump Support on Reddit

We study the emergence of support for Donald Trump in Reddit's political discussion. With almost 800k subscribers, "r/The_Donald" is one of the largest communities on Reddit, and one of the main hubs for Trump supporters. It was created in 2015, shortly after Donald Trump began his presidential campaign. By using only data from 2012, we predict the likelihood of being a supporter of Donald Trump in 2016, the year of the last US presidential elections. To characterize the behavior of Trump supporters, we draw from three different sociological hypotheses: homophily, social influence, and social feedback. We operationalize each hypothesis as a set of features for each user, and train classifiers to predict their participation in r/The_Donald. We find that homophily-based and social feedback-based features are the most predictive signals. Conversely, we do not observe a strong impact of social influence mechanisms. We also perform an introspection of the best-performing model to build a "persona" of the typical supporter of Donald Trump on Reddit. We find evidence that the most prominent traits include a predominance of masculine interests, a conservative and libertarian political leaning, and links with politically incorrect and conspiratorial content.Comment: 10 pages. Published at WebSci2

On the grammar of politics—or why conservatives prefer nouns

Previous research indicates that political conservatism is associated with epistemic needs for structure and certainty (Jost et al., 2003) and that nouns elicit clearer and more definite perceptions of reality than other parts of speech (Carnaghi et al., 2008). We therefore hypothesized that conservatives would exhibit preferences for nouns (vs. verbs and adjectives), insofar as nouns are better suited to satisfy epistemic needs. In Study 1, we observed that social conservatism was associated with noun preferences in Polish and that personal need for structure accounted for the association between ideology and grammatical preferences. In Study 2, conducted in Arabic, social conservatism was associated with a preference for the use of nominal sentences (composed of nouns only) over verbal sentences (which included verbs and adjectives). In Study 3, we found that more conservative U.S. presidents used greater proportions of nouns in major speeches, and this effect was related to integrative complexity. We discuss the possibility that conservative ideology is linked to grammatical preferences that foster feelings of stability and predictability

Wise Guys: Closure and Collaboration in the American Mafia

How do organizations obtain access to valued resources without diluting the loyalties and identities of their members? Network analysts suggest focusing on the boundary-spanning activities of "brokers" who bridge gaps in social structure. In many contexts, however, brokers are viewed with suspicion and distrust rather than rewarded for their diversity of interests. This dissertation examines organizations in which the theoretical deck is seemingly stacked against brokerage and toward parochialism: American-Italian mafia families. Through an institutional analysis of the mafia organization, I trace how ethnic and organizational closure led marginalized actors to seek alternative paths to enrichment beyond the family-controlled networks and industries. Using a historical network data set, I document a division of network labor in which a small number of brokers - often, surprisingly, ethnic outsiders and lower-status criminals - bridged otherwise disconnected islands of criminal activity. More than coordination among elite criminals, it was entrepreneurial action by marginal and excluded actors - outsiders operating largely beyond the control of mafia organizations themselves - that generated the integrated and highly connected mafia network. This dissertation accounts for a striking historical paradox by showing how it was possible for the American Mafia to appear for all intents and purposes to be a well-organized national conspiracy even as the individual groups involved remained organizationally and geographically separate from one another

Data for: Emergence of Diverse and Specialized Knowledge in a Metropolitan Tech Cluster

Code and data for analyzing New York Tech Meetup email networks

Data for: Emergence of Diverse and Specialized Knowledge in a Metropolitan Tech Cluster

Code and data for analyzing New York Tech Meetup email networks.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Endogenous dynamics of institutional change

A parsimonious set of mechanisms explains how and under which conditions behavioral deviations build into cascades that reshape institutional frameworks from the bottom up, even if institutional innovations initially conflict with the legally codified rules of the game. Specifically, we argue that this type of endogenous institutional change emerges from an interplay between three factors: the utility gain agents associate with decoupling from institutional equilibria, positive externalities derived from similar decoupling among one’s neighbors, and accommodation by state actors. Where endogenous institutional change driven by societal action is sufficiently robust, it can induce political actors to accommodate and eventually to legitimize institutional innovations from below. We provide empirical illustrations of our theory in two disparate institutional contexts—the rise of private manufacturing in the Yangzi delta region of China since 1978, focusing on two municipalities in that region, and the diffusion of gay bars in San Francisco in the 1960s and 1970s. We validate our theory with an agent-based simulation

Endogenous Dynamics of Institutional Change

A parsimonious set of mechanisms explains how and under which conditions behavioral deviations build into cascades that reshape institutional frameworks from the bottom up, even if institutional innovations initially conflict with the legally codified rules of the game. Specifically, we argue that this type of endogenous institutional change emerges from an interplay between three factors: the utility gain agents associate with decoupling from institutional equilibria, positive externalities derived from similar decoupling among one’s neighbors, and accommodation by state actors. Where endogenous institutional change driven by societal action is sufficiently robust, it can induce political actors to accommodate and eventually to legitimize institutional innovations from below. We provide empirical illustrations of our theory in two disparate institutional contexts—the rise of private manufacturing in the Yangzi delta region of China since 1978, focusing on two municipalities in that region, and the diffusion of gay bars in San Francisco in the 1960s and 1970s. We validate our theory with an agent-based simulation