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I have always considered the Debt to GDP ration a bad measure.
A better measure would be the annual revenue vs debt.
This measures income vs debt burden, and shows the trend.
So Treasure bulletin for 2011
Income $2,302 T
Outlay $3,598 T
Debt $15.629T
So if someone made $23,000 a year, spent $36,000 a year, and had a $156,000 mortgage,
Do you think they would be a good credit risk?
How long could this person keep getting and maxing out new credit cards?
Sure they have lots of assets, but last time I looked Yosemite is not a liquid asset.
BTW, selling bonds are like getting new credit cards, (certificates of debt)
You're comparing a flow to a stock. If you are comparing the stock of outstanding debt to tax revenue, you'd look at interest expense as a percent of tax revenue (S&P warns that 20% is the danger level) and the amount of maturing debt in the period.
For example, I earn $100 this month, I owe the bank $30 of interest on my credit card balance, and I have to pay a friend back the $80 he lent me. I can't waive my credit card payment and my friend needs his money this month. Therefore if I can't borrow $10 from a different friend (or restructure the outstanding $80) I'll be in default.
During FY2011 in the US there was:
Income: $2,303.4B
Outlay: $3,603.0B
Net Debt Issuance: $1,299.6B
Gross Debt Issuance: $7,807B*
Net Interest Expense: $230.0B
You can read more here: Managing the Federal Debt > Publications > National Affairs
USTreasury update: 2011 debt positioning | atradersrant
Note that the majority of new debt issuance is done with short-term T-Bills and thus are borrowed at exceptionally low interest rates (0.35%?). The problem is that short duration debt increases your interest rate risk when you roll them forward. This is where the stock of national debt can become an issue. The long-term historical average for treasury interest rates is approximately 5%. Our extremely low interest rates have allowed us to increase our debt burden by 50% in three years while reducing our interest expense. The trouble is, that due to our high debt burden and short duration our budget is significantly exposed if interest rates ever return to their historical average. If we were paying an average of 5% on our current debt our annual interest expense would be $781 billion (33.9% of FY2011 revenue!) or more than we pay for Medicaid and Social Security. As our resident MMT'ers will tell you, the US can't default since we are monetarily sovereign and therefore bondholders take virtually no credit risk. However (and I'm sure they will argue this point), the government (and bondholders) does take interest rate risk when it is forced to issue so much new debt each year.
*Someone more qualified than I should audit this number. I pulled the data from here (warning: xls download) - http://tinyurl.com/74soefa