Riccaboni, Massimo; Pammolli, Fabio; Buldyrev, Sergey V.; … - arXiv.org - 2009
The relationship between the size and the variance of firm growth rates is known to follow an approximate power-law behavior $\sigma(S) \sim S^{-\beta(S)}$ where $S$ is the firm size and $\beta(S)\approx 0.2$ is an exponent weakly dependent on $S$. Here we show how a model of proportional growth...