Non-Linear Effects of Economic Globalization on Income Inequality in Iran: Smooth Transition Regression (STR) Model

Due to the important role of economic globalization in income inequality of countries, the purpose of this paper is to investigate the non-linear impact of economic globalization on income inequality in Iran during 1979-2014. For this purpose, is used the smooth transition regression (STR) model. The estimated Smooth Transition Regression (STR) model supports a nonlinear threshold behavior in the relationship between economic globalization and income inequality in the country in a two regime structures with positive effect and a threshold level of about 26/15%. so that increases the intensity of this positive impact with crossing threshold level and entering the second regime.