Marco Battaglini

Eleonora Patacchini

Rebecca B. Morton

We present an informational theory of public protests, according to which public protests allow citizens to aggregate privately dispersed information and signal it to the policy maker. The model predicts that information sharing of signals within social groups can facilitate information aggregation when the social groups are sufficiently large even when it is not predicted with individual signals. We use experiments in the laboratory and on Amazon Mechanical Turk to test these predictions. We find that information sharing in social groups significantly affects citizens' protest decisions and as a consequence mitigates the effects of high conflict, leading to greater efficiency in policy makers' choices. Our experiments highlight that social media can play an important role in protests beyond simply a way in which citizens can coordinate their actions; and indeed that the information aggregation and the coordination motives behind public protests are intimately connected and cannot be conceptually separated.

Social Groups and the Effectiveness of Protests

Kenneth C. Williams

Increasingly, political scientists use the term 'experiment' or 'experimental' to describe their empirical research. One of the primary reasons for doing so is the advantage of experiments in establishing causal inferences. In this book, Rebecca B. Morton and Kenneth C. Williams discuss in detail how experiments and experimental reasoning with observational data can help researchers determine causality. They explore how control and random assignment mechanisms work, examining both the Rubin causal model and the formal theory approaches to causality. They also cover general topics in experimentation such as the history of experimentation in political science; internal and external validity of experimental research; types of experiments - field, laboratory, virtual, and survey - and how to choose, recruit, and motivate subjects in experiments. They investigate ethical issues in experimentation, the process of securing approval from institutional review boards for human subject research, and the use of deception in experimentation.

From Nature to the Lab

Experimental Political Science and the Study of Causality

It begins by examining the roles of the basic actors in elections—voters, candidates, parties and interest groups—and the institutional process through which the actors move. The analytical techniques presented in the first part of the book are then applied to questions about the effects of money and the mass media on electoral outcomes, the extent to which elections can control errant officials, and the problems of measuring public opinion and preferences. Special attention is devoted to the unique issues involved in the congressional redistricting as well as presidential primaries and the Electoral College. The analysis is extended to consider the roles played my minor party and independent candidates and the problems minorities face in achieving representation in the American electoral process.

Rebecca B. Morton

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