p.156: "ignoring the two-month observation at the height of the energy crisis (billings for March-April 1974), the elasticities have an average value of -0.70" || preferred = the 11 non-crisis Spec-I cross-section cells (the headline -0.70 is their average); the excluded -0.06 (Mar-Apr 1974, t=0.89) is flagged by the authors as unrepresentative (DWP curtailment ordinance, fn.19).
Acton, J. P., B. M. Mitchell, and R. Sohlberg (1980): “Estimating Residential Electricity Demand Under Declining-Block Tariffs: An Econometric Study Using Micro-Data.” Applied Economics, 12(2), 145-161