To show that indirect reciprocity can stabilize collective action without the second-order free rider problem, we consider a large population subdivided into randomly formed social groups of size n.

Gun Owners of America details its legal victories in New York, Hawaii, and Illinois to expand concealed carry reciprocity across state lines.

Practicing reciprocity between humans and nature—namely caring relationships between people and nature when they perceive benefits from nature—can contribute positively to both the planet and ...

Nigeria's visa policies lack reciprocity, charging high fees while other nations offer visa-free entry. Discover the impact ...

A recent push for "reciprocity" in international taxation has gained traction, based on the claim that American companies pay disproportionately high taxes abroad while foreign firms pay far less in ...

The reciprocity of light pulse propagation in a disordered photonic structure can be 'switched off' by creating a local, ultrafast nonlinearity. Reciprocity is a fundamental concept in light transport ...

The holiday season and the new year often prompt businesses to reconsider their approach to travel and charitable work, especially how those choices reflect their values. For years, I’ve helped plan ...