@article{eprints647,
           title = {A generalized preferential attachment model for business firms growth rates: I. Empirical evidence},
            year = {2007},
          volume = {57},
           pages = {127--130},
          number = {2},
         journal = {The European Physical Journal B},
       publisher = {Springer},
            note = {PACS.  89.75.Fb Structures and organization in complex systems - 05.70.Ln Nonequilibrium and irreversible thermodynamics - 89.75.Da Systems obeying scaling laws - 89.65.Gh Economics; econophysics, financial markets, business and management },
          author = {Fabio Pammolli and Dongfeng Fu and Sergey V. Buldyrev and Massimo Riccaboni and Kaushik Matia and Kazuko Yamasaki and H. Eugene Stanley},
             url = {http://eprints.imtlucca.it/647/},
        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 {\ensuremath{\zeta}} = 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. }
}