There is little doubt that income distribution among Americans, as measured by the percent of the Gross Domestic Product (GDP) distributed to various income groups, has become less equal in the past 40 years. Aside from the issue of “fairness,” which in and of itself is important, income inequality has significant negative economic impacts. When wealth is thought to be extremely unequal, social unrest can occur, causing among other issues a decline in labor market participation and eventually deterioration of the economy.