Technical Change, Markup, Divestiture, and Productivity Growth in the U.S. Telecommunications Industry
研究1935至1987年美国电信业生产率增长的来源，涵盖AT&T分拆前后，通过结构模型衡量需求、信息强度、加成率、技术进步和研发对全要素生产率增长的贡献，并指出传统TFP增长率严重偏误。
This paper examines the sources of productivity growth for the U.S. telecommunications industry from 1935 to 1987. These years encompass both the pre- and post-AT&T divestiture periods. We formulate a structural model that accounts for both changes in the cost and the demand side of the industry. We measure the contributions of aggregate demand, information intensity of the economy, price-cost margins, relative factor prices, direct and indirect effects of technological progress, and R&D investment on total-factor productivity (TFP) growth rate. We show that TFP growth rate as conventionally measured is a seriously biased measure of rate of technical change in this industry. © 1999 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology