How about these numbers for some statistics.
In the United States...
Average income per household: $46,325
Average income per household with two income earners: $67,348
Average income, males 25 or older: $33,517
Average income, females 25 or older: $19,679
Average salary with high school: $26,505
Avereage salary with bachelor's degree: $43,143
Average salary with some college: $31,04
Average salary with masters degree: $52,390
Average salary with PhD: $70,853
Since 2004, salaries are down 4%
Source for these numbers?