Winner of the 2010 Luebbert Prize for Best Book in Comparative Politics
"There is much to praise in this book. Most importantly, the authors' focus on understanding the mechanism of ethnic cooperation should be highly praised, including the manner in which they tested the major proposed mechanisms against each other. I was also very impressed by the immense amount of fieldwork that the authors devoted to the project, with obvious care given at every stage of the project to obtain meaningful results."
-AFRICAN AFFAIRS
"The authors go beyond the observation that ethnic diversity sometimes impedes cooperation and ask why this might be so. This important work will be an eye opener to those schooled in conventional 'social identity' theory and 'minimal group' experiments. By focusing on causal mechanisms, Coethnicity demonstrates the limitations of simple 'insider favoritism/outsider hostility' interpretations and opens up a new research agenda on ethnic division and cross-ethnic solidarity."
-SAMUEL BOWLES, director, Behavioral Sciences Program, Santa Fe Institute
"Good public policy demands that social scientists go beyond statistical correlations in order to understand the mechanisms that lead to market and government failure. James Habyarimana, Macartan Humphreys, Daniel Posner, and Jeremy Weinstein in Coethnicity have brilliantly, persistently, and innovatively sorted out and identified the mechanisms that undermine the potential of ethnic diversity to enrich society through the gains from trade that ethnic complementarities should provide. From Coethnicity, and now knowing these mechanisms, we are perched to devise remedies that can save us from the lost opportunities of cosmopolitanism and the specter of ethnic cleansing."
-DAVID D. LAITIN, Watkins Professor of Political Science, Stanford University
"An exciting volume with interesting insights into the effects of mixed ethnicity on public goods provision. The authors apply experimental methods in innovative ways to study the mechanisms through which mixed ethnicity hinders cooperation, making the work appropriate for a wide range of readers, from economists to charitable organizations and policy makers."
-ERNST FEHR, director, Institute for Empirical Research in Economics, Laboratory for the Study of Social and Neural Systems, University of Zurich
Ethnically homogenous communities often do a better job than diverse communities of producing public goods such as satisfactory schools and health care, adequate sanitation, and low levels of crime. Coethnicity reports the results of a landmark study that aimed to find out why diversity has this cooperation-undermining effect. The study, conducted in a neighborhood of Kampala, Uganda, notable for both its high levels of diversity and low levels of public goods provision, hones in on the mechanisms that might account for the difficulties diverse societies often face in trying to act collectively.
The Mulago-Kyebando Community Study uses behavioral games to explore how the ethnicity of the person with whom one is interacting shapes social behavior. Hundreds of local participants interacted with various partners in laboratory games simulating real-life decisions involving the allocation of money and the completion of joint tasks. Many of the subsequent findings debunk long-standing explanations for diversity’s adverse effects. Contrary to the prevalent notion that shared preferences facilitate ethnic collective action, differences in goals and priorities among participants were not found to be structured along ethnic lines. Nor was there evidence that subjects favored the welfare of their coethnics over that of non-coethnics. When given the opportunity to act altruistically, individuals did not choose to benefit coethnics disproportionately when their actions were anonymous. Yet when anonymity was removed, subjects behaved very differently. With their actions publicly observed, subjects gave significantly more to coethnics, expected their partners to reciprocate, and expected that they would be sanctioned for a failure to cooperate. This effect was most pronounced among individuals who were otherwise least likely to cooperate. These results suggest that what may look like ethnic favoritism is, in fact, a set of reciprocity norms—stronger among coethnics than among non-coethnics—that make it possible for members of more homogeneous communities to take risks, invest, and cooperate without the fear of getting cheated. Such norms may be more subject to change than deeply held ethnic antipathies—a powerful finding for policymakers seeking to design social institutions in diverse societies.
Research on ethnic diversity typically draws on either experimental research or field work. Coethnicity does both. By taking the crucial step from observation to experimentation, this study marks a major breakthrough in the study of ethnic diversity.
JAMES HABYARIMANA is assistant professor of public policy at the Georgetown Public Policy Institute.
MACARTAN HUMPHREYS is associate professor of political science at Columbia University and research scholar at the Center for Globalization and Sustainable Development at the Earth Institute.
DANIEL N. POSNER is associate professor of political science at the University of California, Los Angeles.
JEREMY M. WEINSTEIN is assistant professor of political science at Stanford University and an affiliated faculty member at the Center for Democracy, Development, and the Rule of Law and the Center for International Security and Cooperation.
A Volume in the Russell Sage Foundation Series on Trust