摘要：The positive relationship between educational attainment
and adult earnings in the United States is strong and has
increased over time. In 1979, college-educated adults
earned 75 percent more per year than did high school
graduates. By 2003, college-educated adults averaged
well over twice the annual earnings of high school graduates.
1 High school dropouts work in the lowest-paid occupational
groups at more than twice the rate of those
who graduated from high school.
