Date on ten U.S. field crops for the period 1950 to 1977 are used to determine whether alternative single variable measures provide the same assessment of relative variability. The results demonstrate that the measurement and analysis of instability may be highly dependent on the choice of...

In this paper, the effectiveness of generic versus brand advertising for yogurt is evaluated, using a polynomial distributed lag model. Brand advertisement is found to be more than twice as effective as generic in increasing per capita consumption of yogurt. These results are then compared to...

Technical efficiencies calculated using aggregated inputs are biased. It is shown empirically and analytically that input aggregation decreases calculated technical efficiencies and changes relative technical efficiencies among firms. Moreover, aggregation fails to separate technical efficiency...