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Industry Policy - Efficiency
    If a consumer were somehow forced or persuaded to pay her full marginal willingness to pay for each unit purchased, then the total cost of buying 9 units would be the blue + green shaded areas to the right. This amount is 45 (green area) + 27 (blue area, triangle remember? 1/2 base x height :) = 72

    In a market economy consumers typically pay the same price for all units purchased so if the price were 5 our consumer would pay a total of 45 for 9 units and the blue area would be her consumer surplus. A financial benefit to the consumer with a value of 27 when the price is 5.

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