If you go to the bank to exchange dollars, it is better to depreciate and exchange more dollars. If you are trading in the foreign exchange market, it is good to go up and down. It's just a matter of fluctuation range. The greater the fluctuation, the higher the income. No matter which direction fluctuates, you can use hedging to make a profit. If you only care about the national economy, it is not good to go up and down. It is best to maintain a relatively stable exchange rate, because inflation and deflation will lead to