In the article, the graph labeled “Gas Guzzling” shows how the quantity demanded of gasoline varies each year. The graph depicts the quantity demanded that occurs at each year’s equilibrium price. Therefore, the best way to interpret the numbers on the y axis is to assume that they represent an equilibrium when both the quantity of gas demanded and the quantity of gas supplied are the same. At this equilibrium, the price is the one that occurs at the intersection of the demand and supply curves.

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