A recent JAMS article reported the following finding: the longer the time between the launch of two adjacent generations in the same product category, the lower the initial rate of adoption of the later generation but the higher its subsequent rate of growth. This note shows that these results could be a method artifact, since they vanish once one controls for differences in the length of the data series used to compute the initial and subsequent rates of growth. So, for the time being, it is premature to accept these intergeneration effects as genuine.
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References
1.
Bass, Frank M. 1969. “ A New Product Growth Model for Consumer Durables .” Management Science15 (January): 215-227 .
2.
Bemmaor, Albert C. andYanghyuk Lee. 2002. “ The Impact of Heterogeneity and Ill-Conditioning on Diffusion Model Parameter Estimates .” Marketing Science21 (Spring): 209-220 .
3.
Lilien, Gary L., Arvind Rangaswamy, and Christophe Van den Bulte. 2000. “Diffusion Models: Managerial Applications and Software.” In New-Product Diffusion Models. Eds. Vijay Mahajan, Eitan Muller, and Jerry Wind. Boston: Kluwer , 295-336.
4.
Pae, Jae H. and Donald R. Lehmann. 2003. “ Multigeneration Innovation Diffusion: The Impact of Intergeneration Time .” Journal of the Academy of Marketing Science31 (Winter): 36-45 .
5.
Putsis, William P., Jr. and V. Srinivasan. 2000. “Estimation Techniques for Macro Diffusion Models.” In New-Product Diffusion Models. Eds. Vijay Mahajan, Eitan Muller, and Jerry Wind. Boston: Kluwer , 263-291.
6.
Van den Bulte, Christophe. 2000. “ New Product Diffusion Acceleration: Measurement and Analysis .” Marketing Science19 (Fall): 366-380 .
7.
Van den Bulte, Christophe and Gary L. Lilien. 1997. “ Bias and Systematic Change in the Parameter Estimates of Macro-Level Diffusion Models .” Marketing Science16 (4): 338-353 .
8.
Van den Bulte, Christophe and Stefan Stremersch. 2004. “Social Contagion and Income Heterogeneity in New Product Diffusion: A Meta-analytic Test.” Marketing Science. In press.
