This question refers to data taken from the U.S. Census. The dollar values take into account the changes in the economy over the years (i.e.,

This question refers to data taken from the U.S. Census.¹ The dollar values take into account the changes in the economy over the years (i.e., inflation). Inflation is a complicated issue, but for this question you do not need to worry about it. A typical high-income household in 1980 earned $125,556. A similar household in 2009 earned $180,001. The relative increase in income for these households from 1980 to 2009 was