Fifty years since Koyck (1954)

*This paper originates from my many conversations with fellow academics in marketing research, who all knew of the Koyck model, but almost none of which knew that Koyck was a Dutchman, let alone that he was affiliated to what is now called the Erasmus University Rotterdam. I thank Teun Kloek for many helpful suggestions, and for providing me with part of the material of Table 2, and Paul de Boer for helpful comments.

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