This 2006 study, commissioned by the Shell Foundation, and prepared by FSG, sees strong growth and opportunity in the nascent field of proactive social investment (PSI). In a typical PSI, a socially-responsible corporation or a charitable foundation uses its capital to invest in new enterprises that can play a critical role in alleviating a societal problem. Although still a very small share of investments, the report estimates that PSIs total nearly US$15 billion, and are attracting increasing interest among foundations and corporations. The study, based on in-depth interviews with 36 pioneers in social investment from the US and Europe, validates the belief that PSIs can simultaneously deliver measurable social benefits and attractive rates of return.