Not all producers have the same cost. Saudi Arabia is the cheapest I know of at $2.80 per barrel. Others can be 10 times higher or more.
Is $2.80 the floor? Maybe not, since SA is a monopoly and can manipulate the price.
I think the point is that we can both agree on is that it's a complex dynamic system, with lots of variables and interconnections, and it reacts to changes.
>Saudi Aramco, the monopoly oil producer in Saudi Arabia, boasts an extraction cost of about $2.80 a barrel
>A geographical comparison from the annual reports of four major international oil companies shows that production costs in Russia were about $22 a barrel
https://www.washingtonpost.com/business/energy/by-pumping-at...