The European Union economy consists of an internal market of mixed economies based on free market and advanced social models. For instance, it includes an internal single market with free movement of goods, services, capital, and labor. The GDP per capita (PPP) was $43,188 in 2018, compared to $62,869 in the United States, $44,246 Japan and $18,116 in China. There are significant disparities in GDP per capita (PPP) between member states ranging from $106,372 in Luxembourg to $23,169 in Bulgaria. With a low Gini coefficient of 31, the European Union has a more egalitarian distribution of income than the world average.