Egyptian women have played an unprecedented role in the Arab Spring democratic
movement, possibly changing women's perception about their own rights and role. We …

In an online multilevel public goods experiment, we implement four treatments where we
gradually increase the marginal per capita return of the global public good. First, we find …

Many public goods can be provided at different spatial levels. Evidence from social identity
theory and in-group favoritism raises the possibility that when higher-level provision is more …

Conflicting theories and mixed empirical results exist on the relationship between ethnic
diversity and trust. This article argues that these mixed empirical results might be driven by …

There is growing evidence that risky cooperation is regulated by the experience of previous
interactions with others. However, it is unclear how the evaluation of outcomes from …

Peer punishment can help groups to establish collectively beneficial public goods. However,
when humans condition punishment on other factors than poor contribution, punishment can …

Political violence is a major impediment to economic development, damaging social,
physical and human capital. By contrast, the manner in which violence influences prosocial …

In the last decade, well over $10 billion has been spent on employment programs designed
to contribute to peace and stability. Despite the outlay, whether these programs perform, and …

Outgroup members are often perceived as threating and untrustworthy, and this is
particularly true for judgments of outgroup males. As race influences perceptions of group …

Introduction Cooperation is an essential framework for the functioning of organisations and
society. The limitations of current measures of organisational cooperation led us to construct …