Payame Noor University Economic Growth and Development Research 2228-5954 15 57 2024 12 21 Economic Growth and Inequality of Income Distribution; Comparison Between Developed Countries, Developing Countries and Economies in Transition Economic Growth and Inequality of Income Distribution; Comparison Between Developed Countries, Developing Countries and Economies in Transition 147 125 11556 10.30473/egdr.2025.72290.6894 FA Mehdi Zahed Gharavi Assistant Professor of Economics ,Department of Economics, Faculty of Humanities, Ayatollah Boroujerdi University, Boroujerd, Iran. Meisam Haddad Ph.D in Economic sciences, Head of the Quarterly Accounts of the Economic Accounts Department in Statistics Center of Iran, Tehran. Fatemeh Sadeghpour Ph.D in Economics, Economics Lecturer, Department of Economics, Faculty of Humanities, Ayatollah Boroujerdi University, Boroujerd, Iran. Mohammad Reza Mohammadi Assistant Professor of Economics, Department of Economics and Accounting, Faculty of Management, Imam Khomeini Maritime University, Nowshahr, Iran. Journal Article 2024 09 10 Income distribution inequality is one of the challenges and problems of every economy. If the inequality of income distribution increases sharply, social discontent will be fueled and the risk of social and political unrest will increase sharply. Considering the importance of the relationship between economic growth and inequality of income distribution and the possibility of differences in this relationship in different countries, this research examines the relationship between economic growth and inequality of income distribution in developed and developing countries and transition economies with the Panel data method reviewed in the period from 2003 to 2019. The findings of the research indicate that in developed countries the Kuznets U-shaped inverted curve has not been confirmed, but it has been confirmed in developing countries. Also, in transitioning economies, the relationship between economic growth and income distribution inequality is not secondary, but linear and inverse. The results of this study can be used in planning and making decisions for the distribution of income among different countries based on the degree of development and forecasting their economic growth. Income distribution inequality is one of the challenges and problems of every economy. If the inequality of income distribution increases sharply, social discontent will be fueled and the risk of social and political unrest will increase sharply. Considering the importance of the relationship between economic growth and inequality of income distribution and the possibility of differences in this relationship in different countries, this research examines the relationship between economic growth and inequality of income distribution in developed and developing countries and transition economies with the Panel data method reviewed in the period from 2003 to 2019. The findings of the research indicate that in developed countries the Kuznets U-shaped inverted curve has not been confirmed, but it has been confirmed in developing countries. Also, in transitioning economies, the relationship between economic growth and income distribution inequality is not secondary, but linear and inverse. The results of this study can be used in planning and making decisions for the distribution of income among different countries based on the degree of development and forecasting their economic growth. https://egdr.journals.pnu.ac.ir/article_11556_365d7e60964ab1ca7d281ff5f8050655.pdf