sentences:  Several economists and political scientists argued that income inequality translates into political inequality, as when politicians have financial incentives to accommodate special interest groups.Researchers such as Larry Bartels found that politicians are significantly more responsive to the political opinions of the wealthy, even when controlling for a range of variables including educational attainment and political knowledge.A "class system" is a society organized around the division of the population into groups having a permanent status that determines their relation to other groups.