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According to the numerical data from the past three decades, income inequality remains a significant challenge on a global scale, irrespective of the countries’ development status. Even though the global economy has experienced growth, income inequalities have not decreased correspondingly. Global integration, international commerce, economic expansions, and changes in labor market dynamics all together participate in the process of shaping economic inequalities. The thesis investigates the impact of various macroeconomic indicators on income inequality and attempts to identify evidence for the bell-shaped Kuznets curve. Fixed- and random-effects models are utilized for the analysis, in which balanced panel data from 52 high- and middle-income countries covering the period 1998 through 2020 are considered. The results of our study identify a U-turned relationship between GDP per capita and income inequality, which does not support the Kuznets hypothesis. Furthermore, we also identified that higher average educational levels reduce income inequality, while international commerce and higher unemployment rates increase it.