“…That the presentation of monetary rewards alone can substantially affect behavior has been demonstrated in a number of studies (see, e.g., Pruitt 1967, 1970, Selten and Stoecker, 1986, Hannan et al, 2005, Gürerk and Selten, 2012, and Hossain and List, 2012. 4 For example, in a field experiment on an agricultural company, Englmaier et al (2012) observe that a higher salience of incentives for quantity (i.e., the pieceͲrate) tends to increase the total amount of lettuce harvested.…”