They switch from being targets of demonization and dehumanization to potential partners in reciprocal altruism.

WSJ: Steven Pinker: Why Violence Is Vanishing

This name is intended to distinguish it from reciprocal altruism.

ECONOMIST: Human behaviour

They shared perishable food, not out of altruism, but as insurance and reciprocal gift giving.

FORBES: A Community Organizer Among Hunter-Gatherers: Do We Have Socialist or Individualistic Genes?