By incentivizing spot trades. If you know that you can buy a widget now and sell it for a guaranteed 5% premium in the future, what do you do? You buy as much as you can get your hands on. If enough people do this, the spike in demand increases the spot price, bringing it in line with the future price and eliminating the premium.
You can have a look at the below link, I believe it will help you better understanding :) https://blog.defichain.com/defichains-future-swap-feature/
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