Abstract
While the adverse impact of cannablism is well documented, it has received very little treatment in the marketing literature (Traylor 1986). The results suggest that the inclusion and Disproportional Cannibalism) does improve the fit to the data. Most models have attempted to avoid the Independence From Irrelevant Alternatives property by only modeling Disproportional Competition. The Asymmetric Market Share (AMS) model explicitly incorporates the influence on share of Disproportional Cannabalism as well as the influence on Disproportional Competition. Models such as the adjusted Logit model rely on some overall meausure of the influence of all other offerings. As such, they cannot distinguish between the two sources of disproportional influence on share. The AMS model overcomes this diagnostic weakness.
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