具有网络外部性特征产品的配额限制与差异化策略

Quotas Restrictions and Vertically Differentiation with Network Externalities

研究了当产品具有网络外部性特征时 ,配额限制对质量作为长期战略变量时的内生质量选择的影响。政府首先制定进口配额限制 ;企业然后选择其产品质量 ,并同时产生质量成本 ;最后 ,企业在国内市场进行数量竞争。证明了当产品不具有网络外部性时 ,高质量产品的质量水平总低于有网络外部特征时的质量水平 ,两种质量的比值也低于具有网络外部性特征时的质量差异度 ,市场上产品质量的加全平均值低于具有网络外部性时的平均质量水平 ,且随产品网络外部性强度的增加而增加 ;而低质量产品却正好相反。

In this paper, we study the effect of QR's (Quotas Restriction) on endogenous quality choice with network externality when quality is a long-run strategic variable. The government first commits to an import quota. Then firms simultaneously choose their qualities bearing quality costs at this stage. In the following stage they compete in quantities in the domestic market. We show that the product quality of higher quality without externality is lower than the quality with externality, The average level of product quality and the degree of quality differentiation is increased with externality. All case is reverse for the lower quality product.