I think the evolving model of Social Impact Bonds (SIB) is intriguing and can lead to support for some great innovation and scaling that government can't do effectively today. At the core of the idea of an SIB is the partnership between government, service providers and 'impact investors'. This sort of partnership has never really existed before. This is a good article outlining the benefits for each part of that partnership - worth reading to further understand how SIBs might work.