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...

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...