Author's headline is the set of consistent IV marginal-price elasticities; the two coded IV MPE cells (Entire sample -.268, obs1381; declining/flat -.2905, obs1378) are marked preferred. || 'All of the statistically consistent estimates of the elasticity of residential electricity demand with respect to marginal price are in the range -.27 to -.30.' (p.155); 'the IV estimate of -.28 is well within the bounds of the other consistent estimates' (p.154).
Henson, S. E. (1984): “Electricity Demand Estimates Under Increasing-Block Rates.” Southern Economic Journal 51(1), 147-56