18. Véase, por ejemplo, Dan Ariely, Anat Bracha y Stephan Meier, «Doing Good or Doing Well? Image Motivation and Monetary Incentives in Behaving Prosocially», American Economic Review 99, nº 1 (marzo de 2009), pp. 544-555; Stephan Meier, The Economics of Non-Selfish Behaviour: Decisions to Contribute Money to Public Goods (Cheltenham, Reino Unido, Edward Elgar Publishing Limited, 2006); Stephan Meier, «A Survey of Economic Theories and Field Evidence on Pro-Social Behavior», en Bruno S. Frey y Alois Stutzer, eds., Economics and Psychology: A Promising New Cross-Disciplinary Field (Cambridge, MA, MIT Press, 2007), pp. 51-88.