In recent years, there has been a growing interest among general people, researchers and policymakers in income inequality, its causes, and its effects. The most popular index of income inequality is the 'Gini index', which measures the inequality among levels of income of the people of any country. A Gini coefficient of zero means perfect equality, where everyone has the same income, and a Gini coefficient of 1 (or 100 percent) expresses maximum inequality.