Originally posted by: dullard
Be careful with your words, many people confuse deficit and debt. I wasn't sure from your deficit title and debt post that you too might be confusing them.
The government sells bonds. A bond is a loan. Someone gives the government a chunk of cash. In return the government promisses to pay it back + interest later. When that time comes, the government just sells another bond to pay the principal and another one to pay the interest.
While $8 trillion is a lot, you do need to keep it in perspective.
This graph helps here. If we had no debt, then we currently could get a permanent 9% tax cut. While that is significant, a 9% cut isn't massive. To keep this thread political, what happened to that straight dropping line starting in the middle of year 2000?
Why do we keep spending without paying the principal? Because that is what Americans do. They finance their current spending addiction with credit cards and home equity loans. The government is the same, especially Republicans in the last ~50 years.