A Generalized Preferential Attachment Model for Business Firms Growth Rates - I. Empirical Evidence
European Physical Journal B, Vol. 57, No. 2, pp. 127-130, May 2007
Posted: 26 Nov 2007 Last revised: 24 Dec 2007
We introduce a model of proportional growth to explain the distribution P(g) of business firm growth rates. The model predicts that P(g) is Laplace in the central part and depicts an asymptotic power - law behavior in the tails with an exponent z = 3. Because of data limitations, previous studies in this field have been focusing exclusively on the Laplace shape of the body of the distribution. We test the model at different levels of aggregation in the economy, from products, to firms, to countries, and we find that the predictions are in good agreement with empirical evidence on both growth distributions and size-variance relationships.
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