Inequalities that use < or > symbols are plotted with a dashed line to show that the line is not included in the region. Inequalities that use ≤ or ≥ symbols are plotted with a solid line to show that ...

Since World War II, inequality in the U.S. has gone through two, dramatically different phases. In the first phase, known as the great compression, inequality fell. Incomes rose for people in the ...