The evolution of large-scale cooperation among genetic strangers is a fundamental unanswered question in the social sciences. Behavioral economics has persuasively shown that so called strong reciprocity plays a key role in accounting for the endogenous enforcement of cooperation. Insofar as...

The evolution of large-scale cooperation among genetic strangers is a fundamental unanswered question in the social sciences. Behavioral economics has persuasively shown that so called ‘strong reciprocity’ plays a key role in accounting for the endogenous enforcement of cooperation. Insofar...

We study the evolution of a social norm of `cooperation' in a dynamic environment. Each agent lives for two periods and interacts with agents from the previous and next generations via a coordination game. Social norms emerge as patterns of behavior that are stable in part due to agents'...

Experimental evidence indicates that free riders and strongly reciprocal papers coexist in the public goods game framework. By means of an evolutionary analysis, we provide an endogenization of this behavioral regularity.

People often sacrifice their self-interest for a group to which they belong, even when outsiders are harmed so that the sacrifice has no net benefit. Two experiments (conducted on the World Wide Web) suggest that people do this, in part, because they think that cooperation on behalf of the group...

The lack of progress in global climate negotiations has caused scholars to refocus on prospects for lower-level agreements that might substitute for, supplement, or motivate a global mitigation agreement. This paper contributes to the emerging literature on polycentric approaches to climate...

Climate cooperation increasingly looks like individuals reaching out beyond traditional interactions to expand new networks, work with others to spot patterns, and take initiative to learn new complex systems; adapt these shared insights into new solutions; develop empathy, patience, and...

This paper examines characteristics of cooperative behavior in a repeated, n-person, continuous action generalization of a Prisoner' Dilemma game. When time preferences are heterogeneous and bounded away from one, how "much" cooperation can be achieved by an ongoing group? How does group...

This paper examines characteristics of cooperative behavior in a repeated, n-person, continuous action generalization of a Prisoner's Dilemma game. When time preferences are heterogeneous and bounded away from one, how "much" cooperation can be achieved by an ongoing group? How does group...