%P 498
%T Statistical properties of business firms structure and growth
%O   PACS:  05.45.Tp Time series analysis

    05.40.Fb Random walks and Levy flights

    89.90.+n Other topics in areas of applied and interdisciplinary physics (restricted to new topics in section 89)

%V 67
%I EDP Sciences
%A Fabio Pammolli
%A Kaushik Matia
%A Dongfeng Fu
%A Sergey V. Buldyrev
%A Massimo Riccaboni
%A H. Eugene Stanley
%D 2004
%L eprints650
%X We analyze a database comprising quarterly sales of 55624 pharmaceutical products commercialized by 3939 pharmaceutical firms in the period 1992-2001. We study the probability density function (PDF) of growth in firms and product sales and find that the width of the PDF of growth decays with the sales as a power law with exponent ?? = 0.20 ?? 0.01. We also find that the average sales of products scales with the firm sales as a power law with exponent ?? = 0.57 ?? 0.02. And that the average number products of a firm scales with the firm sales as a power law with exponent ?? = 0.42 ?? 0.02. We compare these findings with the predictions of models proposed till date on growth of business firms.
%R 10.1209/epl/i2004-10070-4
%J EPL (Europhysics Letters)
%N 3