Which statement best describes the pattern of income growth in the United States since the 1970s? 1. a sharp rise in income among those with top incomes and stagnate income among those with middle and lower incomes
2. a sharp rise in income among those with top and middle incomes and stagnate income among those with lower incomes
3.slow income growth in all income categories
4. moderate income growth in all income categories
5. substantial income growth in all income categories