Gypsy

Hellomello
I think that it might help to decouple the concept of how much something costs to produce and the price that you can sell it at.
You said
Why I am confused is that, if future prices will rise, wouldn’t resource owners want to increase SUPPLY now, before it gets too expensive to supply it in the future?
If the future price is going to rise because of increased demand, vice an increased cost to produce the supplier has an incentive to withhold sales and make the price rise quicker to realise his gains (assuming he can affect the market in this way), or hold onto his reserves and sell later.