Answers are grounded in this paper and cite their sources.
Scott E. Atkinson, Robert Halvorsen, Parametric Efficiency Tests, Economies of Scale, and Input Demand in U.S. Electric Power Generation, International Economic Review, Vol. 25, No. 3 (Oct., 1984), pp. 647-662
No takes yet. Share an insight, caveat, or question.
Atkinson et al. (1984) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: