“…Recently, the literature has extended to the determinants of income inequality, such as equality of opportunity (Aiyar & Ebeke, 2020 ), tourism development (Nguyen et al, 2020 ), economic volatility (Chang et al, 2019 ), urban inclusiveness (Qiu & Zhao, 2019 ), economic complexity (Lee & Wang, 2020 ), and the consequences of the current pandemic (Covid-19) (Bonacini et al, 2020 ). More interestingly, a different strand of research, the Stolper–Samuelson (SS) model in Heckscher–Ohlin (HO) trade theory, provides the theoretical background for understanding the effect of trade on income inequality.…”