这个知识点在哪里

问题如下：

According to the Organisation for Economic Co-operation and Development, income inequality is:

选项：

A.contributing to the increase in the purchasing power of the middle class. B.decreasing with globalization, skill-biased technological change, and changes in countries’ policy approaches. C.determined as the ratio between the average income of the richest 10% of the population to the poorest 10% of the population.

解释：

C is correct. To measure income inequality, OECD follows throughout time the evolution of the ratio between the income received by the 10% of people with the highest income to income received by the 10% of people with the lowest income. A growing ratio shows growing income inequalities. Inequality increases according to OECD with globalization, skill-biased technological change, and changes in countries’ policies. Also according to OECD, income inequality contributes to the “squeeze” of the middle classes.