I have developed some very interesting and far-reaching theories by substituting labor for kinetic energy and capital for potential energy and then applying the laws of thermodynamics.
Not that you care.
But in the truest sense, money (think wealth) can neither be created nor destroyed. Sure the government can print more money, but that will cause inflation and thus currency devaluation.
As far as interest rates go, look at it this way. If you keep borrowing and borrowing, eventually you will run out of potential lenders. For simplicity sake, think of an individual person.
At first, maybe they can get a bank loan for say 7%. But when that money is used up, maybe next they will go to an unsecured line of credit at 15%. That's because they exhausted the available money supply at the lower rate. But if they keep borrowing, eventually the only people who will loan them money will be demanding 30% or more.
As far as the government goes, if you exclude Social Security from general revenue (which I think should be the case), we are spending 28% of our available tax revenue on interest payments for the national debt. Just interest. 28%.
If you were a bank, would you loan someone money if they were spending 28% of their net income on the interest payments for their credit cards? Uh, no.
Now here's the other problem. The national debt is not revolving credit. In other words, when you run up a bunch of debt in a low interest rate environment in the absence of a 30-year bond, all of that debt will have to be reissued (rolled over) in say 10 years. What will interest rates be in 10 years?
And when you are able to find financing for your current debts from foreign creditors who at this time have no better means to employ their trade surpluses and are temporarily parking their dollars in your bonds, where are you going to find that money in 10 years?
Just because we have financed $8 trillion in debt at 4.5% interest right now does not mean that we will be able to find financing for $8 trillion at 4.5% ten years from now.
We might be able to find financing for $6 trillion at 10%. But how will we suddenly pay off $2 trillion in debt? Or how will we afford to pay these high rates of interest?
How would you suddenly pay off a large debt? Let's say China "called" their loan of $250 billion. It would be done on the secondary market, which would drive interest rates up, up and away. That is the inverse relationship of bond price to interest rate. So you either pay off the balance (but how?) or suffer the consequences with high interest rates that ravage the economy.
Sad but true.
Maybe you know someone who was in business for himself. It seemed like he was doing well, that business was good. But all of a sudden everything he had was being liquidated and he lost his business. What happened? It seemed like everything was doing fine. Then you found out that it was a long time coming and he did a great job of concealing his financial problems. You never would have guessed that he was in such dire straits. So maybe you know a person like that. Maybe he is your Uncle. Maybe his name is Sam.