Analysis of economies of scope by data envelopment analysis: comparison of efficient frontiers

Economies of scope exist when joint production is more efficient than separate production for several kinds of activities. The main purposes are to develop a method for identifying the economies of scope by using data envelopment analysis, which involves the use of non-parametric production frontiers and does not require cost information on inputs and outputs. The economies of scope are measured by comparing efficient frontiers, where the most robust multipliers are defined for evaluation of the dominance relation of efficient frontiers.