> how much economically extractable oil is available on earth is actually a fundamental property of the universe.
Affordability requires something to exist. Once all the oil is used up it won't be affordability that prevents you from obtaining some. As oil still exists, your ability to afford it is entirely a social construct. There isn't some fundamental property of the universe that prevents you from having that oil. The only thing standing in your way from not getting the oil you want to have is what people believe. Again, resource allocation is entirely a social construct. Scarcity is the reason for that construct. Allocation is not a thing where there is no scarcity.
> Affordability requires something to exist.
Ok so jumping back to applies, say I have an apple and Mr A and Mr B want it. I'm going to give the apple to the person who pays me the most money. To keep it simple, this is the only apple. Maybe I've drawn a smiley face on it to make it an artwork, maybe there has been a breakout of Apple Plague, I dunno.
How do you square that with this conception of affordability? Since only one apple exists, is the person who doesn't get the apple in a state where they can afford it even though they didn't have enough money to buy it?
> The only thing standing in your way from not getting the oil you want to have is what people believe.
I'm pretty sure it is physical limits. I can think of a lot of schemes for infinite oil it is were available. There'd be a lot of space travel involved.