Income inequality is the uneven distribution of income among household or individual. The concept of income inequality is much related with the idea of income "fairness". When there is a high level of inequality, income inequality is generally considered as “unfair." It means that large number of people receives a small share of the total income and a small number of people receive most of the total income. While conservative social scientists argue that income inequality is mainly the result of more workers in the average household and their age and education. Furthermore, income inequality can be the product of region, gender, education and social status. Income inequality is often measured by comparing income shares across different quintiles of the income distribution, or by using an index such as the Gini coefficient.