The level of deposit depends on the ratio of the value of the subject matter itself to the deposit. Take the 2000 points of the stock index as an example, each point is 300, so the value is 2000 * 300 = 600000. If the margin ratio is 15%, the exchange needs a margin of 90,000.

As for the research of university teachers, it is more written and more theoretical. However, university teachers should not be poor, and there is always a futures deposit.