China have been manipulating their currency before this week's drop. They use USD to buy CNY to prop up CNY exchange rate. If they stop buying CNY using USD, th

China have been manipulating their currency before this week's drop. They use USD to buy CNY to prop up CNY exchange rate. If they stop buying CNY using USD, the value of CNY would fall (happening now). So China is technically no longer manipulating their currency. Why are they doing this? My guess is to respond to trade war tariff. The US is manipulating USD through Fed interest rate. The Fed lowers interest rate to prop up borrowing and economic growth. I think China has figured out a way to deal with the situation. They will adjust the USD-CNY exchange to prop up their own economy. This trade war is turning into a silly cat and mouse game. China is not making a deal. They have ways to get around tariff and TPP. War is about deception. The US needs some sneaky attack if it wants to win.