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PISA is the programme of international student assessment. It assess students' performances on "real life" tasks. It measures the capacity of students in different country.

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Gini coefficient is the most utilized measures of economic inequality. For example, the gini coefficient in China 2016 is 38.50 (data from microsoft bing).

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The little problem or bug here is that people like baby, children, or elders do not work and make money, but the calculation divides the whole country's population, so it will not be very accurate.

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GDP per capita is a country’s economic output divided by it’s population. It helps measure the quality of people's life in a country.

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It is the gross domestic product. GDP produces an economic status of a country. This is the economic value of all goods and services made within a specific time