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A Generalized Preferential Attachment Model for Business Firms Growth Rates: I. Empirical Evidence

Pammolli, Fabio and Fu, Dongfeng and Buldyrev, Sergey V. and Riccaboni, Massimo and Matia, Kaushik and Yamasaki, Kazuko and Stanley, H. Eugene (2006): A Generalized Preferential Attachment Model for Business Firms Growth Rates: I. Empirical Evidence. Published in: The European Physical Journal B , Vol. 57, No. 2 (16. May 2007): pp. 127-130.

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Abstract

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 ζ = 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 its predictions are in good agreement with empirical evidence on both growth distributions and size-variance relationships.

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