...we would like to share one idea suggested by Sir Ronald Cohen, known as the father of European venture capital, who has turned his entrepreneurial skills to the social enterprise sector. In 2007, he co-founded Social Finance U.K., a British organization that has developed a financial instrument that pays investors a return based on measured improvement in a particular social issue. What is extraordinary is how it is constructed and how it calculates its return on investment.

http://www.utsandiego.com/news/2012/apr/03/tp-brits-philanthropy-model-could-pay-dividends/