This case is accompanied by a Video Short that can be shown in class or included in a digital coursepack. Instructors should consider the timing of making the video available to students, as it may reveal key case details. Zipcar is a start-up organized around the idea of 'sharing' car usage via a membership organization. This case describes several iterations of the Zipcar business model and financial plan. These iterations include a very early version and a version developed just prior to the launch of the business, as well as data from the first few months of operations. Students are called on to analyze the underlying economics and business model for the venture and to discover how these assumptions are holding up as the business is actually rolled out.