The Federal Reserve prints money to buy American debt. If the national debt matures after many years, the Federal Reserve will take back the dollars. Who will the dollar belong to? How to deal with it? America is a debt currency. That is, borrowing money to issue money. Of course, some of the borrowed money will be returned to the Fed as interest. The practice in the United States is to borrow new debt to pay interest on old debt. Americans believe that as long as the American economy develops better and better, the ability to repay interest will improve. In this way, the interest that the United States needs to repay on interest can be repaid. Of course, if the debt of the United States is paid off, then the dollar is meaningless. However, some of Lao Song's views are also debatable. Lao Song believes that buying gold is the right way. I don't think so, because gold prices are manipulated. Besides, there is not so much gold for us to buy.