Reciprocity

Reciprocity may refer to:


 * Ethic of reciprocity, a general philosophical principle of most philosophies and religions.
 * Reciprocity (social psychology), in-kind positive or negative responses of individuals towards the actions of others.
 * Reciprocity Norm (negotiation)
 * Reciprocity (evolution), mechanisms for the evolution of cooperation.
 * Reciprocity (international relations), a principle that favours, benefits, or penalties that are granted by one state to the citizens or legal entities of another, should be returned in kind.
 * Reciprocity (cultural anthropology) and in relation to non-market economic exchange
 * Serial reciprocity, where the benefactor of a gift or service will in turn provide benefits to a third party.