For example, if you buy $500 to $530, you will earn $30, otherwise you will lose $30, but you only have $5, and the remaining $450 is provided by the dealer, so you can't play if you lose $5, because you have no financial authority, and the dealer will no longer provide funds for you to do it.
This is a general understanding. The concept of foreign exchange is not like this. There are too many aspects involved. Interested parties can add 7 1445000 1. Let's communicate with each other.