10. 11. 12. 13. 14. Strategies such as public funding of schools, compensatory education, pre- school programs, affirmative action, and campaign-finance reforms focus on the existence of inequality. The distribution of income is not a zero-sum game. The link between incentives and economic growth suggests a certain trade-off between equity and efficiency. Opinion polls reveal that many Americans begrudge millionaires their wealth. The gap between consumption and income can never be particularly large. A \"household\" refers to people related by blood or marriage. A quintile is 20% (one-fifth) of a population group. An annual household income of $19,000 would not be in the lowest quintile in 2005. The top quintile's share of all income exceeds 50% in 2005. The closer the Lorenz curve is to the diagonal, the more unequal the distribution of income. A Gini coefficient of 0 represents perfect equality in the distribution of income. Class stratification refers to a situation in which people are trapped in a particular income rank. Earnings mobility is pervasive. There is very little intergenerational mobility; the children of the rich stay rich and the children of the poor stay poor