Power-law Distributions(幂律分布)

f ( x ) = a x − k f(x)=ax^{-k} f(x)=ax−k

An example power-law graph, being used to demonstrate ranking of popularity. To the right is the long tail, and to the left are the few that dominate (also known as the 80–20 rule).

在我们日常生活中，Power-law Distributions(幂律分布)是一种常见的数学模型，如二八原则：20%的人口拥有80%的财富，20%的上市公司创造80%的价值，80%的收入来自20%的商品等等。