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All empirical data and the resulting parameters are subject to error. In this paper we explicitly use the standard, but hardly profound, “model” [Formula: see text] as a lens for better viewing empirical studies in search of empirical generalizations in marketing. This lens is especially valuable when the unit of analysis is the individual consumer. However, even when a macro study contrasts price elasticities across cities, this O = T + E framework can be very helpful.
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Morrison et al. (1995) studied this question.
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