Income inequality Income inequality is about the measurement of people’s household or individual based on their income across the various participants in an economy. It is also known as the gap between the rich and poor, wealth and poverty, the different of income between populations or individual (Ram, R. (1988)).
Measurement To measure the income inequality have to use the Gini coefficient which developed by Italian statistician in 1912. The Gini coefficient is measuring the income inequality based on the value of a frequency distribution (for example levels of income). The value of the Gini coefficient is between the range 0 to 1. Therefore, 0 that means “perfect equality ’’ which every person is getting the same income and 1 that means “perfect inequality’’ which is all income change to the share of the population with the highest income. The Gini coefficient is also to be used for to measure wealth inequality. This use of Gini coefficient requires that no one has a negative net wealth. Besides that, the Gini index often used which is the Gini coefficient expressed as a percentage, but it is equal to the Gini coefficient multiplied by 100. (Most of the time people are using the Gini index for calculating the income inequality.)
Graph1(source:http://people.stfx.ca)
The graph above shows that the Gini coefficient is equal to the area which is shaded to the yellow colour.
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