Quality variations and maximal variety differentiation
研究双寡头市场中允许质量变化时，企业品种选择的影响，发现序贯博弈中纯策略均衡仅存在最大品种差异化，且质量差异化最小。
We allow quality variations in a duopoly of locationally differentiated products à-la-Hotelling (1929). We analyze the impact of quality variations on the choices of the varieties produced. We show that in a sequential game of variety choice and subsequent quality and price choice there exist only maximal variety differentiation equilibria in pure strategies. Maximal variety differentiation is also the perfect pure strategies equilibrium of a sequential game of variety choice followed by quality choice and later by price choice. In both games there is minimal quality differentiation at equilibrium.