Socio-economic inequality is most often examined in scientific works on economic topics. Social inequality is linked to restrictions on property, vot-ing rights, freedom of expression and assembly, access to health care or education, and employment. In other words, these are differences in the position of social groups in the hierarchy of society, which are usually de-termined by education, kinship, occupation, etc. Economic inequality is the inequality of the country's population income (population income differentiation) and expenditure distribution, i.e., the difference in their size between different social strata and groups in society. Income inequality is prevalent not only in developing but also in developed countries, and there-fore, this social phenomenon is one of the most pressing global problems. Income inequality is defined as differences in income in an economy between persons, individuals, households, countries, or any other identifiable combination of entities. Different measurement methods are used to meas-ure income inequality - Lorenz curve, Tayle index, Robin Hood index, coefficient of variation, decile ratio, but the most popular and most com-monly used is Gini coefficient. It has economic, social and psychological consequences that reduce the progress of the state and its development op-portunities, as well as the quality of life of the people. Income inequality in many countries has gone beyond economic security and has become a brake on the quality of life of the country's population and the development of the economy as a whole, and a source of social tension. The increase in income inequality in recent years has been driven by political instability, income redistribution, globalization, financialization, technological progress, international trade, and other caus-es. The issue of inequality is also important in the 2030 Agenda for Sus-tainable Development, which aims to reduce inequalities within and between countries. Thus, income inequality is a global problem that requires global solutions. This involves improving the regulation and monitoring of financial markets and institutions, encouraging development assistance and foreign direct investment to regions where the need is greatest. Facilitating the safe migration and mobility of people is also key to bridging the widen-ing divide. (original abstract)