1. Alberto Alesina, Rafael Di Tella, and Robert MacCulloch, 2003, 'Inequality and happiness: are Europeans and Americans different?' mimeo
2. Bjorn Bartling, and Ferdinand von Siemens, 2005, 'Inequity aversion and moral hazard with multiple agents,' mimeo
3. Pedro Rey Biel, 2004, 'Inequity aversion and team incentives,' mimeo
4. Monkeys reject unequal pay