The document discusses Social Impact Bonds (SIBs) and introduces a distinction between Macro-SIBs and Micro-SIBs. Macro-SIBs involve substantial government participation as an outcome payor or financial administrator and often require legislation. Micro-SIBs are private transactions initiated by non-governmental entities where government plays a minimal role. While different, Macro and Micro-SIBs are interdependent, as the goal is to scale local innovations achieved through Micro-SIBs to benefit more people. The document provides an example of a Macro-SIB created through municipal legislation in Richmond and contrasts the key elements of Macro versus Micro-SIBs.