The next stage in the evolution of the digital economy involves the creation of what can be called the “Internet of the World”—an expanding web of transactions, anticipated today by on-demand platforms such as Uber and Airbnb, that eventually will occur across trillions of networked devices and penetrate every sphere of human activity. This brief looks at the many legal questions raised by these novel services, in particular, at the regulatory classification of on-demand services, as well as the application of antitrust provisions, the imposition of taxes and fees, and the assignment of liability to these new platforms.