The document discusses carsharing and shared mobility services. It provides an overview of different carsharing models including roundtrip, one-way, peer-to-peer, and fractional ownership models. It also discusses the ecosystem of shared mobility services which includes bike sharing, transportation network companies, and flexible transit services. The document outlines factors that contribute to the success of carsharing like parking pressure, high density, and mixed land uses. It also examines the role of government in supporting carsharing through policies around insurance, parking, planning, and integration with public transit.