First, you need to know the calculation method of GDP. If nothing else, the import and export is like a reservoir. Less input and more output, less water in the reservoir. The trade deficit means that imports exceed exports, and different countries have different attitudes towards the deficit. The traditional view is that a country should ensure the basic balance of international trade, which is conducive to maintaining domestic financial security. Because your money, that is, currency, can be controlled by other countries after payment, then it can interfere with the market through stock futures and so on. However, the United States is a big consumer country, and its economic aggregate is large enough to counter the financial risks that the trade deficit may bring.

In recent years, the United States has paid special attention to its trade deficit, because the rise of China and Japan have brought the deficit of the United States to a level that can attract its attention. Furthermore, because the American economy declined after 9 1 1, the government increased expenditure (most obviously military expenditure) and reduced taxes, and the fiscal deficit ballooned sharply. This makes the financial risk in the United States higher, because both China and Japan hold a large amount of US Treasury bonds. The money was obtained through the trade surplus with the United States, so the United States began to pay special attention to and emphasize the control of the trade deficit, and there were many trade frictions with China, including the appreciation of the RMB since 2003.

Let's talk about the second question first. From the traditional point of view, paper money must correspond to the same amount of gold and silver hard currency reserves in order to ensure the stability of prices. When you say that the US dollar is a reserve currency, it is also based on the good economic operation mode and stable economic situation of American countries, and many countries have large-scale trade with the United States. Of course, this is also related to the Bretton Woods system. At that time 1947 after the second world war, the prices of major capitalist countries soared, and only the United States stood out. Because the pound was used as the internationally used guarantee currency, the US dollar took over the baton and the US dollar was exchanged for 1 ounce of gold. Of course, by the oil crisis in the 1970s, the Bretton Woods system collapsed and the dollar and gold depreciated sharply. Of course, this is also related to the economic development of other European countries and Japan.

The first thing a country's currency should do is to stabilize its own economy. If the United States prints paper money indiscriminately, it will first suffer from its own economic system, and high inflation will bring about great economic recession and panic. Moreover, the exchange rate is variable, and other countries can judge the trend of the American economy through various channels or information, so that its price fluctuates in the foreign exchange market. In addition, printed money will enter the circulation field through the market. It is impossible to say that whoever takes it out directly will use it, and there is strict institutional guarantee. So entering the circulation is the beginning of the erosion of the national economy. Before liberation, the Kuomintang issued gold certificates and excessive money, precisely because of the needs of the war, eroding people's property at an unimaginable rate of inflation. Therefore, for the sake of long-term stability, no country will print paper money to earn immediate benefits.