http://xkcd.com/980/huge/#x=-2316&y=-840&z=6 (chart of worlds money)

http://www.opm.gov/oca/11tables/indexSES.asp
http://chartingtheeconomy.com/?p=1337
http://www.bea.gov/national/nipaweb/SelectTable.asp#S1
http://www.census.gov/compendia/statab/cats/income_expenditures_poverty_wealth.html
does not include social security or medicare or medicad http://www.kff.org/insurance/snapshot/OECD042111.cfm
https://www.cia.gov/library/publications/the-world-factbook/geos/us.html
http://en.wikipedia.org/wiki/Money_supply