# 帕累托法則

(重新導向自 帕雷托法则)

## 經濟學

1992年的「聯合國開發計劃署報告」載有一個將不平等現象視為非常明顯和易於理解的形式，即所謂的「香檳杯」效應[6] 其中顯示全球收入分配非常不平衡，全球最富有的20％的人口控制著世界收入的82.7％。[7]

## 數學筆記

64/4相關性也意味著4％至64％之間的32％「公平」面積，其中前20％（16％）的80％下降80％（上升20％）（下降了16％）涉及相應的上下底部效應（32％）。這也大致符合上述世界人口表，其中第二個20％控制了12％的財富，而最高的20％（可能）控制了16％的財富

## 平等措施

### 吉尼係數和胡佛指數

${\displaystyle H=G=|2A-1|=|1-2B|\,}$
${\displaystyle A:B=\left({\frac {1+H}{2}}\right):\left({\frac {1-H}{2}}\right)}$

### Theil 指數

${\displaystyle T_{T}=T_{L}=T_{s}=2H\,\operatorname {artanh} (H).\,}$

## 參考文獻

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8. ^ Human Development Report 1992, Chapter 3, [2007-07-08]
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25. ^ On Line Calculator: Inequality