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Discusses new products introduced in the marketplace as being repurchasable and concerns itself with an estimate of the ratio of first‐time buyers to repeat buyers, relating this to the product expansion rate and time between first‐time and repeat buying. Gives fundamental hypotheses and defines the problems involved using tables and mathematical equations for emphasis giving examples of applications. Concludes that the model here may be usefully employed to obtain indications of the market wherever the sale of a product is expanding rapidly – but the turnover is also large.