As equality functions as a crucial element for sustainable growth, inequality has caused some concerns for economists. Okun stated that “The income distribution can be made to look soothingly equal or shockingly unequal, depending on how the figures are lined up.” , which emphasises the importance of inequality measures. There are a few types of inequality measures and each of them is employed to benefit us in different ways.
The most commonly used inequality measure is income inequality. One of the factors that contributes to the popular usage of income inequality is that it can be presented with the Lorenz curve. The income distribution data is summarised in the Lorenz