Actually I think this thread isn’t giving you perfectly clear answers.
What do you do if you need money, but you don’t have it? Let’s say you want to buy a house valued at $300,000, but in savings you only have $60,000. Well you go to a lending institution and fill out a mortgage application. The lender looks into your credit history, looks into your income, your assets and et cetera and decides whether or not you are likely to repay this loan and whether or not you can afford the loan payment.
Since individuals are very much capable of going bankrupt or not being able to pay off a debt, lenders have to be careful. While a bank may recovery some of its money when it forecloses on a house, usually it won’t recover all of it–so people defaulting on their loans is a loss for the lender.
The reason we have to fill out lengthy applications and go through the wringer to get credit extended to us is because we aren’t “known” to the lender, nothing about us as individuals tells them “this guy is likely to repay his debt.”
That is why agencies exist which rate and score our credit.
Such agencies exist for governments, too. The U.S. has had the highest possible credit rating for a very long time. The U.K. and Japan and a few other countries have the highest credit rating as well (usually expressed as AAA or Aaa depending on what entity is doing the rating.)
Because major, established governments aren’t seen as much of a credit risk, they don’t have to apply for loans like you or I do.
Instead, they can just print up pieces of paper “treasury securities.” These pieces of paper give the holder of that paper the right to redeem it for cash, at some point in the future.
It’s no different at all than me writing $50 on a piece of paper with my name on it, and saying “at a date 10 years from now, you can redeem this with me for $50.” I could then sell it to you at the price of $40. So, over 10 years you’ve earned $10 in interests and can redeem the paper for $50, earning back your initial $40 investment plus $10.
Most people wouldn’t buy Martin Hyde Bonds because no one knows anything about me, they don’t know my credit history and et cetera. So individuals typically can’t sell their debt on the open market.
Governments can, in the form of securities–millions of pieces of paper which act like IOUs, and give the holders of the paper the right to redeem them for their face value once they reach maturity.
Depending on how much money the U.S. government needs to raise, the amount of new securities being issued will fluctuate. Sometimes we will even issue special bonds for special purposes, for example during World War II there were special bonds issued by the government to help pay for the war effort.
The creditor-debtor arrangement isn’t tied to individuals, though. If China buys a few hundred millions dollars worth of treasury securities, it only gets that money back if it redeems them at maturity. But, circumstances may arise where China wants to sell its securities to someone else, it does this by selling them on the open market. Over time, the value of given securities fluctuates, there is a market for this stuff and individuals and big-time investors all participate in it.
By and large, the U.S. government isn’t terribly concerned about investors selling and buying their treasury securities on the secondary market, the government is going to pay whoever redeems it once it reaches maturity, and it may have been sold and resold a thousand times in the interim. To the government that makes no functional difference.
What can happen though, is if one investors owns a huge number of bonds that can devalue the bonds by flooding the market with them. It’s not unlike what can happen in the stock market, if an investor sells a huge amount of a companies stock, flooding the market with it, the value will drop rapidly.
Absolutely not, treasury securities give you the right to redeem them when they mature, nothing more, nothing less.
Think of this like you would the mortgage we were talking about earlier. If your initial lender “sells” your debt to a third party, as long as the initial agreement is still in force, that new owner of your debt can’t “bankrupt you over night.” They can’t say, “we know you signed a 30-year mortgage, but we want it all right now–if you don’t pay it you’re bankrupt.” Lenders don’t have that power, nor do people who own U.S. treasury securities.