Marshall Sahlins, a well-known American cultural anthropologist, identified three main types of reciprocity (generalized, balanced and negative) in the book Stone Age Economics (1972).
Marshall Sahlins, antropolog budaya terkenal Amerika, mengidentifikasi tiga jenis utama timbal balik (tergeneralisasi, seimbang, dan negatif) dalam buku Stone Age Economics (ekonomi zaman batu) pada tahun 1972.