Economists have traditionally assumed that individual behavior is motivated exclusively by extrinsic incentives.  Social physchologists, in contrast, stress that intrinsic motivations are also important.  In recent work, economic theorists have started to build psychological factors, like...

We explore the role of reciprocity in wage determination by combining experimental and survey data. The experiment is similar to Berg, Dickhaut and McCabe`s (1995) and is conducted with Ghanaian manufacturing workers. The survey relates to the same sample workers and the firms within which they...