Harvard researchers recruited subjects from around the world via a crowdsourcing website. Then they tested the participants’ cooperation with a few economic games. Split into groups of four, people received 40 cents and a request: choose how much to put into a group fund. The communal cash would be doubled and then evenly shared amongst the whole team.
SOURCE LINK to the full article: http://blogs.discovermagazine.com/80beats/2012/09/21/quick-lend-me-some-money-humans-act-more-generously-under-time-pressure/