Different countries have different exchange rate.
A country with a fixed exchange rate system will have an established exchange rate that the government considers appropriate. If there is a change, the central bank will intervene.
The exchange rate of floating exchange rate countries is determined according to market supply and demand. Many people want to buy products from a country, which leads to a large demand for money and a high exchange rate. On the contrary, the exchange rate is very low
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The first question: the United States can't do it. If so, the dollar will have no credit and will never buy our grain again, unless it just wants to cheat the grain once and hide on Mars.
The second question: excessive money is only one of the reasons for inflation. Other reasons leading to inflation are: the increase in demand and cost will lead to the rise in prices and the relative depreciation of the currency; There are also changes in the economic structure, that is, the differentiation of productivity in different departments, and the style of "aligning" treatment with high-efficiency departments will also lead to rising production costs and rising prices; There is also imported inflation, that is, inflation in one country, which also occurs in another country through the transmission of import and export, exchange rate and other mechanisms. Inflation caused by excessive currency issuance is a relatively low-level embarrassment. It was the military government that did that embarrassing thing. .