Representative ind estimate for no-PDF (yellow) study; author preference unknowable. Value -0.909 confirmed against Dahl DEDD ref H&F79 (El-ii_mne machinery except electrical IR -0.909); Dahl cross-check CONFIRMED.
Halvorsen, R., and J. Ford (1979): “Substitution Among Energy, Capital, and Labor Inputs in U.S. Manufacturing.” In: The Structure of Energy Markets: Advances in the Economics of Energy and Resources, vol 1 (ed. Pindyck R.S.), JAI Press Inc.: Greenwich, Connecticut; 51-75