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In many real-life situations ranging from financial to volcanic data, growth is described either by a power law – which is linear in log-log scale or by a quadratic dependence in the log-log scale. The purpose of this paper is to explain this empirical fact.,The authors use natural scale invariance requirements.,In this paper, the authors used natural scale invariance requirement to explain the ubiquity of quadratic log-log dependencies. The authors also explain what to do if quadratic log-log models turn out to be insufficiently accurate. In this case, scale-invariance requirements lead to dependencies which in the log-log scale take cubic, 4th order, etc. form.,To the best of authors’ knowledge, this is the first theoretical explanation of the empirical quadratic log-log dependence.

Why quadratic log-log dependence is ubiquitous and what next