U.S. liabilities total $87 trillion...

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...if this article is correct.

The greatest fiscal challenge to the U.S. government is not just its annual deficit but its total liabilities. Our federal balance sheet does not include the unfunded social insurance obligations of Medicare, Social Security, and the future retirement benefits of federal employees. Only in the small print of the financial statements do you get some idea of the enormous size of the unfunded commitments. Today the estimated unfunded total is more than $87 trillion, or 550 percent of our GDP. And the debt per household is more than 10 times the median family income.

Full link: http://www.usnews.com/opinion/mzucke...ebt_print.html