Vertical and Horizontal Scope Economies in the Regulated U.S. Electric Power Industry
研究了美国电力行业发电与配电之间的纵向经济性，以及不同发电类型（水电、核电、火电）之间的横向经济性，发现纵向范围经济为8.1%，横向为5.4%。
This paper investigates vertical economies between generation and distribution of electric power, and horizontal economies between different types of power generation in the U . S . electric utility industry. Our quadratic cost function model includes three generation output measures (hydro, nuclear and fossil fuels), which allows us to analyze the effect that generation mix has on vertical economies. Our results provide (sample mean) estimates of vertical economies of 8.1% and horizontal economies of 5.4%. An extensive sensitivity analysis is used to show how the scope measures vary across alternative model specifications and firm types.