“…Thereafter, it is widely used to study inequalities in various fields, such as macro-economy [3,52], environment [53,54], health [11,35,36,41,55], transportation [56], education [10,57] and others. Compared with other common measure indexes that are applied to measure inequality, such as Theil index, Coefficient of Variation, and Centration Index, Gini Coefficient has a wider application [58].…”