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ip between these two and there was no trend and mobility in the income inequality level before globalization (Robin Stryker, (1998) pp 22). The relationship between globalization and inequality can be investigated by using different channels like factor price convergence due to international migration, commodity price equalization and capital mobility which results in wage inequality and rate of returns of capital among different countries and convergence in capital income growth. There are some examples of globalization:

Japan was emerged based on its export industries in 1960s.

USA, Western Europe and Japan emerged as economic centres of global economy and became famous as triad economy representing the world economy.

Triad economies were the major contributor in global income, consumption, production, trade and FDI.

Definitions and Measures of inequality: 不等式的定义和度量：
Here the term income inequality refers to the distribution of income among all the citizens of the world, distribution among countries, within countries and among wage earners. If we consider income inequality from the perspective of a country, it may be dependent on different internal and external factors. Globalization is an important external factor. This globalization process has significantly benefitted a large number of countries. For last 200 years the world has become more unequal but the process of globalization has reduced the income gaps between and within countries. The World Bank has divided countries depending on the income level into 3 groups as high, middle and low income. Though countries and populations change by time but the high income countries contribute around $43 trillion which is 69% of world income but it comes to only 16% of the population. On the same time low income countries contribute approx (Martyna Sliwa, (2007) pp 122). $400 billion which is less than 1% of the world income but accounts for 12% population. As an impact of globalization the number of people living below poverty line has come to half. The three concepts of uneven distribution i.e. inter country inequality (or concept 1), within country inequality (or concept 2) and global inequality (concept 3) can't result in the same movement.

Concept 1 deals with divergence and convergence among countries. Earlier it was understood in terms of inequality but later on most of the researchers used cross country regression and β convergence. They considered each country/year as an observation in this regression. But this was not a proper method for the measurement of the income inequality as countries have unequal population size.

Concept 2 inequality deals by weighing the countries by its population but it is a low-cost approach as it needs only two variables i.e. mean income(GDI per capita) and population size.

This inequality creates the largest part of global inequality. Basically global inequality is composed of concept 2 and inequality that arises due to differences in income within countries.

Concept 3 inequality is basically based on household surveys since the main sources of distributional data that are considered are household surveys (A.J.C. Manders, Y.S. Brenner, (1999) pp 560). Because it is not possible to have world-wide household survey, we can take the combination of individual countries' surveys, and personal per capita consumption or disposable p