This post was originally produced for Forbes. At a meeting of the U.S. Advisory Board and G7′s Social Impact Investing Taskforce at the White House last month, Prudential committed to build a $1 billion impact investment portfolio by 2020. “Impact investing uses the power of markets to unleash private capital for public good. Done well, it can scale sustainable solutions to some of our toughest social challenges, such as affordable housing, clean energy, quality education, and workforce development,”