A company normally intends to charge the most profitable price. Ascribing their actions to one force or another is useless, it mainly is supply and demand that

A company normally intends to charge the most profitable price. Ascribing their actions to one force or another is useless, it mainly is supply and demand that force them to set lower prices. When their input costs go up, they raise prices because they otherwise their last product produced would be unprofitable, and when prices go down it is because their customers would go elsewhere if they did not.