"Fortunately, increasing the number of big bets on social change is not dependent on available wealth, willingness to give it away or the desire to support social change. All of that is in place," said Foster. "Continued bold pioneering by donors, and heightened understanding of their lessons learned, can pave the way for others to find and structure philanthropic deals. If we were to close the aspiration gap, billions of additional dollars would flow to the world's most challenging problems."