"Some academics divide the middle class into an upper bracket that includes professionals and middle managers who hold postgraduate degrees and often earn more than $100,000 and a less affluent lower middle class that typically has some college education with household incomes around the national median.
Median household income in the United States was $52,175 in 2008, according to the U.S. Census Bureau."
According to:
http://www.reuters.com/article/2010/09/14/us-usa-taxes-middl...
"Some academics divide the middle class into an upper bracket that includes professionals and middle managers who hold postgraduate degrees and often earn more than $100,000 and a less affluent lower middle class that typically has some college education with household incomes around the national median. Median household income in the United States was $52,175 in 2008, according to the U.S. Census Bureau."