Market Structure and Broadband Internet Quality
研究了互联网服务提供商数量及其产品类型对宽带网速的影响，发现两个及以上有线提供商的市场网速更高，且排除内生性修正会低估此效应。
This paper investigates the effects of the number of firms and their product‐type on broadband Internet quality. We estimate a model that relates the actual speeds delivered, in census block groups to the number of wireline and wireless internet service providers (ISP's), cost and demand conditions, and correction terms for the endogeneity of market structure. Model estimates show four main findings. Wireline speeds are often higher in markets with two or more wireline ISP's than with a single wireline ISP. Excluding the correction terms from the analysis understates this effect. Increases in wireline speeds are larger in the upstream direction, and there is no relationship between wireline speeds and the number of wireless ISP's.