The noted archaeologist Richard Leakey ascribes the essence of what makes us human to the reciprocity system: We are human because our ancestors learned to share their food and their skills in an honored network of obligation,9
Robert B. Cialdini
The noted archaeologist Richard Leakey ascribes the essence of what makes us human to the reciprocity system: We are human because our ancestors learned to share their food and their skills in an honored network of obligation,9
Robert Beno Cialdini (born April 27, 1945) is an American psychologist and author. He is the Regents' Professor Emeritus of Psychology and Marketing at Arizona State University and was a visiting professor of marketing, business and psychology at Stanford University.
