Inequality
Economic inequality (also described as the gap between rich and poor, income inequality, wealth disparity, wealth and income differences or wealth gap) is the state of affairs in which assets, wealth, or income are distributed unequally among individuals in a group, among groups in a population, or among countries.
To simplify that, it is when a small group of the citizens receives much more higher income that the GDP per capita and the larger group receives much less. In this case, the GDP per capita will appear to be high, yet most of the citizens will not be enjoying the high income.
Inequality is in fact one of the characteristics of a free market where is there is no or minimal government interference.