Editing Reciprocal altruism (section)

=== Humans ===
{{Main|Reciprocal altruism in humans}}Examples of reciprocal altruism in humans include helping injured individuals, sharing food, tools, or knowledge,<ref>{{Cite journal |last=Trivers |first=Robert L. |date=March 1971 |title=The Evolution of Reciprocal Altruism |url=https://doi.org/10.1086/406755 |journal=The Quarterly Review of Biology |volume=46 |issue=1 |pages=35–57 |doi=10.1086/406755 |issn=0033-5770}}</ref> and providing assistance in crises with the expectation of future aid. In social interactions, individuals often engage in direct reciprocity, such as returning favors or lending resources with an implicit understanding of future repayment. Indirect reciprocity is also observed,<ref>{{Cite journal |last=Nowak |first=Martin A. |last2=Sigmund |first2=Karl |date=October 2005 |title=Evolution of indirect reciprocity |url=https://doi.org/10.1038/nature04131 |journal=Nature |volume=437 |issue=7063 |pages=1291–1298 |doi=10.1038/nature04131 |issn=0028-0836}}</ref> where individuals help others based on reputation, encouraging mutual cooperation within a community. Economic and political systems rely on reciprocal altruism through trade agreements, diplomatic alliances,<ref>{{Cite journal |last=Keohane |first=Robert O. |date=1986 |title=Reciprocity in international relations |url=https://doi.org/10.1017/s0020818300004458 |journal=International Organization |volume=40 |issue=1 |pages=1–27 |doi=10.1017/s0020818300004458 |issn=0020-8183}}</ref> and social contracts, where long-term benefits outweigh short-term costs. Additionally, studies in [[game theory]], such as the [[Prisoner's dilemma|Prisoner’s Dilemma]], illustrate how cooperative behaviors emerge and stabilize when individuals recognize the advantages of mutual support.