Regression Models for Market-Shares

On the background of a data set of weekly sales and prices for three brands of coffee, this paper discusses various regression models and their relation to the multiplicative competitve-interaction model for market-shares.
  

Regression models for market-shares

Kristina Birch,Tue Tjur and Jørgen Kai OlsenCopenhagen Business School

1. DETERMINISTIC MODELS

1.1. The Simple Model

Let b = 1,...,Bdenote the brands of a given fmcg. In our example, the fmcg is coffee. Let...