Gasoline prices are a hot topic, especially when they go up like they have in Houston recently. Gas is a strange market, though: for one thing, can you think of anything else you use daily whose price is advertised on street corners? Groceries don’t do it with milk or bread, and clothing stores don’t do it with tube socks; but every gas station posts prices in letters two or three feet tall. What makes those prices rise and fall, apparently without reason? Many people think that big oil controls the price at the pump, but they're mistaken.
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