A well-established principle of product development holds that a small group of early adopters can spur mass-market acceptance of a new product. What is less well understood is how those early adopters react when that product or its brand is accepted by the mass market. As Wharton marketing professors David Reibstein and John Zhang explain in this video, the company could experience a backlash as early adopters move on to other new products. A case in point: Porsche saw a decline in sports car sales after it entered the SUV mass market. Research by Reibstein and Zhang discusses reasons for the backlash and suggests a strategy for dealing with it.