The same reason that the Thai baht depreciated. At that time, he borrowed dollars from the American government, bought a lot of Thai baht and sold it. At this time, a large number of businessmen also sold Thai baht, which led to a large increase in Thai baht flowing in the market, and the government's foreign exchange reserves were insufficient to cope with it, thus depreciating. Then, I bought Thai baht to pay back the government money. The difference between borrowing and returning is earned.