Journal Of The Econometric Society

An International Society for the Advancement of Economic
Theory in its Relation to Statistics and Mathematics

Edited by: Guido W. Imbens • Print ISSN: 0012-9682 • Online ISSN: 1468-0262

Econometrica: Jul, 1967, Volume 35, Issue 3

A Test for the Product Life Cycle<472:ATFTPL>2.0.CO;2-G
p. 472-484

Klaus Brockhoff

The product life cycle is a well known concept in marketing theory. It is generally assumed to comprise four phases. So far, however, quantitative evidence of this shape of the product life cycle has been missing. This paper deals with methods of estimating the parameters of such life cycles and two methods of estimating product life cycles are given. An iterative method is developed that is of independent value as well as providing a good starting point for Marquardt's generalized least squares method. It is shown that there exist complementary and substitutive effects between the product under consideration and the sales of related products sold by the same company.

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