Buying down shows selling and opening positions on trading futures software, which means bearish, corresponding to buying and closing positions. Generally speaking, no matter what kind of shorting in the world, compared with doing more, the cost is the lowest, the handling fee is the lowest and the profit is great. Domestic gold futures products with the same delivery period have a shorter delivery period, which is also a deposit and handling fee, and the operating space is much lower than that of international products.