It doesn't sound like there is any leverage in this explanation? Isn't that part of the purpose of derivatives -- for leverage? If you are buying and selling

It doesn't sound like there is any leverage in this explanation? Isn't that part of the purpose of derivatives -- for leverage? If you are buying and selling faster than the transactions can be closed is that where the leverage comes in? So some multiple or percent of the transaction should be counted as more than the buy/sell price?