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Help for stock index futures log return problem

Profits from stock index futures are calculated based on the margin ratio.

Currently, the margin for stock index futures launched in my country is 15% of the contract value in May and June, and 18% of the contract value in September and December.

So, if you have 500,000 in your account, and the current points are assumed to be 3,000 points, and you are buying 1 lot more, and you are buying the May or June contract, you need to pay a 15% deposit. 135,000. If it rises by 50 points, it will reach 3050 points. Then your current income is:

3050*300-(3000*300)=15000

That is to say, you used 135,000 yuan to make a business of 900,000 yuan. , earned 15,000 yuan. This is what is meant by leverage.