TY  - JOUR
N2  - 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 ? = 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. 
SN  - 1434-6028
UR  - http://dx.doi.org/10.1140/epjb/e2007-00133-4
AV  - none
TI  - A generalized preferential attachment model for business firms growth rates: I. Empirical evidence
EP  - 130
N1  - 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 
ID  - eprints647
SP  - 127
A1  - Pammolli, Fabio
A1  - Fu, Dongfeng
A1  - Buldyrev, Sergey V.
A1  - Riccaboni, Massimo
A1  - Matia, Kaushik
A1  - Yamasaki, Kazuko
A1  - Stanley, H. Eugene
PB  - Springer
IS  - 2
JF  - The European Physical Journal B
Y1  - 2007///
VL  - 57
ER  -