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If the margin for futures trading is 5% of the contract amount, the futures trader can control the contract assets 20 times the transaction amount.
Take copper for example. Suppose the value of the primary contract is 20W and the margin ratio is 5%, which means that you can buy 20W copper with 5% of 20W, that is,1w. Isn't that 20 times?
Suppose a fund holds 200 million shares of assets, then it can sell up to 400 million stock indexes. Now a stock index contract is almost 80W, so it is 500 lots, and at most 500 stock index futures can be sold!