The Sharing Economy: An old concept made new through the internet-based sharing of underutilized space, skills, and stuff for monetary and non-monetary benefits. Recently, a proliferation of start-ups have created digital platforms to connect owners with consumers. These companies encourage people—and businesses—to use resources more efficiently and to share non-product assets (like time) as well as conventional “stuff.” Citizens can share space in their homes (Airbnb), seats in their car (Lyft, Sidecar, UberX), places to park (Park Circa), used clothing (ThredUp), outdoor gear (gearcommons), time in the day (TaskRabbit, Instacart), and even capital (Zopa, Prosper). This trend has attracted significant attention from thought leaders (in 2011, Time Magazine crowned it one of ten ideas that will change the world), venture capital (Uber recently received $258M in funding from Google Ventures, and a recent round of financing for Airbnb would value it above $10B), the media, and, most recently, Congress. Nevertheless, regulatory mechanisms have not kept pace.