That's true, but the collision that OPEC practices is illegal here in the US, which is at least one reason we're not an OPEC member. They don't set prices as others have suggested, they merely set production targets to loosen or tighten supply from member nations. Prices merely follow the supply in an inverse manner. US producers can individually set production goals based on what the rest of the world is doing, but they are not allowed to confer with each other and set production across the industry.