“…Subsequent notable contributions include Lancaster (1971), d 'Aspremont, Gabszewicz, and Thisse (1979) and Salop (1979). Existing research on competition in product lines have largely focused on product customization by either endogenizing the range of appeal for a single product, supposing that firms provide a product characterized by an interval ½a; b (see Dewan, Jing, and Seidmann (2000); Dewan, Jing, and Seidmann (2003) or Alexandrov (2008)) or by allowing firms to acquire costly information about individual consumer preferences that allow product customization (Bernhardt, Liu, and Serfes 2007) to a representative consumer.…”