HBR’s fictionalized case studies present dilemmas faced by leaders in real companies and offer solutions from experts. This one is based on the case study “Acquiring Zipcar: Brand Building in the Share Economy,” by Susan Fournier, Giana Eckhardt, and Fleura Bardhi (Boston University School of Management, 2012).

A version of this article appeared in the July–August 2013 issue of Harvard Business Review.