Statistical Properties of Business Firms Structure and Growth

الأصل · EN

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 β= 0.20 ± 0.01. We also find that the average sales of products scales with the firm sales as a power law with exponent α= 0.57 ± 0.02. And that the average number products of a firm scales with the firm sales as a power law with exponent γ= 0.42 ± 0.02. We compare these findings with the predictions of models proposed till date on growth of business firms.