In this study, U.S. manufacturing firms' profitability measures including profit margins and returns on equity are examined over the 1971-2005 period. We find strong support for the “insulation hypothesis” as our results show that the profitability ratios and the valuation multiples of U.S....

Category-management models serve to assist in the development of plans for pricing and promotions of individual brands. Techniques to solve the models can have problems of accuracy and interpretability because they are susceptible to spurious regression problems due to nonstationary time-series...