Humans were built to share
Young children are more likely to share rewards equally with their peers if collaboration is involved than if they received an unexpected and unearned 'windfall'.
Source: http://www.cosmosmagazine.com/news/4540/humans-were-built-share
Cindy Taylor Cinthia Moura Claudette Ortiz Coco Lee Connie Nielsen Cristina Dumitru Daisy Fuentes