Crude oil is a limited market
If 1 million barrels is offered insufficiently, then the consumers with a US$ 20 higher price must be persuaded to save this 1 million barrels.
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Conversely, if there is 1 million barrels more supply than demand on the market, then the price must drop by US$ 20 for demand to rise by that 1 million barrels.
Cargo ships stay in port, cargo ships sail at reduced speed to save oil. Truck freighters desperate, much too few orders. All these messages in the time of the world economic crisis were counted together about 5.5 million barrels less oil demand. As a result, the price crashed to US$ 32.40 at the end of November 2008.
Pages 324 to 335: We need an international organisation for oil exit