Let’s say i have a box of widgets i want to sell one month from today.
I want to protect myself in case widget prices fall in one month, so i want to gree to a price to sell widgets, today, for delivery in one month.
You and I both expect that box of widgets to sell for $100 in month.
So, today, I offer to sell it to you for $100 in one month.
You don’t care too much to buy a box of widets in one month. You especially don’t care if all you are going to do is agree to buy something for $100 that you think will be worth a $100 anyways in one month, and run the risk that’s its not actually $100 in month. There’s nothing in it for you.
So, I instead offer to sell it to you for $90. Now you are interested. You expect to make $10 in profit for taking the risk of buying the widgets from me in one month.
Here the futures price is $90, the expected spot price in one month is $100, and the risk premium is $10.
The risk premium is your compensation for taking on the risk of agreeing to buy the box of widgets today, one month forward.