Empirical research on reference price has typically assumed that consumers use either an internal reference price (IRP) or an external reference price (ERP), but not both, in brand choice decisions. In this article, the authors assume that consumers use both IRP and ERP but may consider one of them more salient than the other. The authors develop a model that segments consumers on the basis of the differences in the importance they assign to each type of reference price as well as in their brand preferences and responses to marketing-mix variables. The authors calibrate the model on data for four categories: liquid detergents, ketchup, tissue, and yogurt. In all four categories, the proposed model performs significantly better than the one that assumes that consumers use either IRP or ERP exclusively. The authors discuss the managerial implications of this finding.

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Promotions are being used with increasing frequency by manufacturers facing highly competitive markets, which is causing concern among some marketers who feel that frequent promotions can hurt a brand. Nevertheless, there is little empirical evidence to either support or dispel such fears. To fill this gap in the literature, the authors propose a brand choice model that provides an estimate of the dynamic effects of promotions on loyalty to the brand and customers’ sensitivity to the price of the brand, and measures whether promotional purchases reinforce or reduce subsequent response to similar promotions. They estimate a random effects heteroskedastic covariance probit time-varying parameter model on household scanner panel data from the liquid detergent category. Their results indicate that increased purchases using coupons erode brand loyalty and increase price sensitivity. In addition, the authors find that the effect of features and displays on brand choice is reinforced by prior feature and display purchases, respectivly, as well as by feature and display purchases associated with price cuts. Future research directions are also discussed.

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