This chapter shows that the well-known Bass and Mansfield models of diffusion can be derived from the mixing of consumers with varying propensities to buy, thereby offering an alternative interpretation of the diffusion process and of the model parameters. In addition, it shows that most other models of diffusion are consistent with this interpretation. Link to the article
BEMMAOR, A.C. (1994). Modelling the Diffusion of New Durable Goods: Word-of-mouth Effect Versus Consumer Heterogeneity. In: G. Laurent, G.L. Lilien, B. Pras eds. Research Traditions in Marketing. 1st ed. Boston, MA: Kluwer Academic Publishers, pp. 201-229.