Advertising and monopoly power: The case of the electric utility industry
With respect to R-H's conclusion, the authors stand by their original hypothesis and results given in their paper. Furthermore, although 1974 is likely a transitional year, it is more comparable to 1977 than to 1967. Thus, R-H's results support, rather than contradict, the results of the C-C study.
EDITOR—I agree with Treasure and MacRae that the greatest determinant of the power of a study is its design.1 Minimisation improves power by comparing similar groups but there is a similar technique—randomised block design—which has even more power.2 ::: ::: In …