It is exactly as simple as supply and demand. There are always external factors that impact either of those two. In the US supply is impacted partially through the cost of regulation. In OPEC and particularly Saudi Arabia supply is controlled by the state (and not market forces).
Suggesting that it isn't the Saudis (who appear to hold sway over other OPEC production) is like suggesting that the fixed Yuan to the dollar of the 80's and 90's wasn't because of the Chinese. It is central planning.
Allow me to EDIT this message and add something. You'll see the table I posted earlier. Any entity with a profit motive would not purposely drive the prices of their goods down. There is a happy medium for a profit driven entity to cut supply to maintain the balance between volume AND price. The purpose of my initial post was to say what perhaps you are which is that I don't see a rational economical reason for them to be doing what they're doing.
I believe there are more instances of the abridgement of freedom of the people by gradual and silent encroachments by those in power than by violent and sudden usurpations. James Madison
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