In a series of studies by Delgado and colleagues (2005), participants chose to share or not share money with their assigned partners based on false written descriptions of their partners' trustworthiness and not the level of sharing actually demonstrated by their partners in the game. These results suggest that:

Mankiw attributes – chapter 1 and his 10 principles – differences in living standards within a countryover time and across countries at a moment in time to: a. the presence or absence of inflation and unemployment.b. the allocation of resources between private markets and the public sector.c. those that have dealt successfully with the efficiency v. equality tradeoff and those that haven’t.d. differences in productivity.e. ones that think at the margin and respond to incentives and those that don’t.