that communication enhances cooperation in social dilemmas. This article reports a meta-analysis of this literature (forty …-five effect sizes) and finds a large positive effect of communication on cooperation in social dilemmas (d = 1.01). This effect is … messages (d = 0.46). The communication-cooperation relationship is also stronger in larger, compared to smaller, group social …

monitoring, conflict resolution, enforcement, and/or the delegation of authority to intergovernmental organizations. This article …

Surprisingly high levels of within-group cooperation are observed in conflict situations. Experiments confirm that … external threats lead to higher cooperation. The psychological literature suggests proximate explanations in the form of group … which cooperation is a rational response to an external threat. In the model, groups vary in their willingness to help each …

two distinct cues within the context of a newspaper story about the Iraq War to test four theoretical models of the … opinion formation, which suggests that individuals will attend to news events that conflict with their expectations in an …

instability. The analysis suggests a bleak prognosis for domestic peace in postinvasion Afghanistan and Iraq as the causal factors …

influence on the most or least attentive citizens. Analysis of Iraq War data shows that local losses have a greater effect on …

war in Iraq. They employ a novel measurement model and a database of survey marginals to estimate weekly time series of …

The Middle East is one of the most conflict-prone regions—butwhy? The Collier-Hoeffler model of civil war provides … significant predictor of conflict. For conflict in the Middle East, a more complex picture emerges. Consistent with Collier and … decrease the likelihood of conflict. They also find that ethnic dominance is significant, while social fractionalization is not …