The U.S. Census Bureau reports that higher levels of education are closely associated with higher average earnings for workers aged 25 to 64. For workers with less than a high school diploma, 2007 earnings were $20,689 — $7,601 less than earnings for workers with a high school diploma. The attainment of a college degree has an even greater impact on earnings. Graduates with a four-year degree earned an average salary of $47,240 in 2007, and those with a professional degree earned almost $90,000.
The difference in the salary earned by higher-educated workers compounds over a lifetime. The estimated earnings during the worklife (approximately 40 years) of a full-time worker who didn't complete high school are about $1 million dollars. Completing high school increases earnings by about a quarter of a million dollars, and completing a bachelor's degree raises worklife earnings to over $2 million.
Finally, people with less education often have fewer choices in life and are more likely to depend on government services than the rest of the population: 8.7 percent of high school dropouts were unemployed in June 2008 — versus 2.3 percent of college graduates.
Source: U.S. Census Bureau, Current Population Survey, Annual Social and Economic Supplement, 2008