英文文献：Competition and Product Choice in Option Demand Markets
英文文献作者：Gilad Sorek
英文文献摘要：
This paper provides first analysis of horizontal product differentiation in health care markets with option demand. I show that differentiation choices in option demand market differ from those obtained in spot markets analyzes. This is because option demand induces competition over inclusion under insurance coverage, whereas in spot markets providers are competing over the marginal consumers. In addition providers that are perceived as substitutes in the spot market - after exact medical needs reveal, may be perceived as complements in option market - before actual medical needs emerged. I show that in the model option demand market competition in simultaneous moves yields efficient horizontal differentiation and excessive investment in quality. Moreover I show that sequential moves result in asymmetric equilibrium with first mover-gains to the leading provider, too little horizontal differentiation and yet higher expected utility for consumers (compared with simultaneous moves).