Forecasting Market Shares from Models for Sales

Dividing forecasts of brand sales by a forecast of category sales, when they are generated from brand specific sales–response models, renders biased forecasts of the brands’ market shares. In this note we propose as an alternative a simulation-based method which results in unbiased forecasts of market shares. An application of this forecasting technique to a five brand tuna fish market illustrates its practical relevance.

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