D buy more, do more, and buy up, all of which have the same meaning and different names. In fact, if you buy in the future, the price will become higher, and if the price goes up, you will earn. If the price falls, it will lose money, * buy first and then sell *

K short, short, buy down, optimistic about the future price decline. If the price goes down, you will earn, and if it goes up, you will lose. * sell first and then buy * (it can be understood that you borrow someone else's stock to sell first, hoping that the price will come down in the future, and then earn the difference when you buy it back).

What we usually hear about the long and short sides is the contest between these two camps.

If the market is short, there is a high probability that the price will be lower in the future.