With examples drawn from the Sharing Economy, such as Uber and Airbnb, Diaz-Granados and Sheehy demonstrate how law facilitates and constrains the operation of these companies as they deliver convenient goods and services. They offer fresh insights into how and why these platforms disrupt existing legal norms, economic markets and social practices. The authors' analysis provides an innovative law-based model, the Platform Operator-User-Provider model (PUP).