Here, we have the income distribution within the US, most people in the middle.

在这里， 我们有美国内部的收入分配，大多数人在中间。

One way to estimate inequality is with a number called the Gini index, which is calculated by comparing the income or wealth distribution of a perfectly equal society to the actual income or wealth distribution.

估计不平等的一种方法是使用称为基尼指数的数字，该指数是通过将完全平等社会的收入或财富分配与实际收入或财富分配进行比较来计算的。