Final answer:
Balanced reciprocity is the exchange of gifts of roughly equal value at set intervals, aiming to establish and maintain social relationships.
Step-by-step explanation:
When people exchange gifts of roughly equal value at set intervals, they are participating in a form of exchange known as balanced reciprocity. This type of exchange is common in various societies and is characterized by an unspoken agreement to provide a return gift of approximately equal or slightly greater value after an unspecified period of time. The purpose of balanced reciprocity is to establish and affirm social relationships rather than gain material advantage. It includes a degree of unspoken calculation in the selection of gifts which helps to maintain and intensify these relationships over time.