The MacArthur Foundation, Chicago Community Trust, and the Calvert Foundation announced the launch of a new collaboration dedicated to mobilizing capital for social impact investments in Chicago. In this article, MarksJarvis explores the significance of the $100M fund (MacArthur has committed $50 million, the Chicago Community Trust $15 million, and Calvert Foundation will be selling Calvert Community Investment Notes). The collaboration, called Benefit Chicago, is “intended to make it possible to lend money to nonprofits and community improvement endeavors that otherwise likely wouldn't raise the money they need.”