Analog disks are very harmful, and they are all idealized models. Your successful model in the simulation state will basically lose money when you turn to the real offer. If you want to learn technology, you need a real knife and a real gun. In order to avoid short positions, you'd better put the upfront funds into the maturity market in equal parts, because most people will short positions many times in the face of greed and fear.

If you are a retail investor, a firm transaction is an instant transaction. Faced with a big contract with hundreds of millions of dollars every day, you won't even spend money on that cost (except for ups and downs).

Ideally, you can't make a deal. If there is, I think we can try a two-color ball. In addition, you can also try to find a small contract with no turnover, which is more likely.