We can also compute the dollar value of her consumer surplus from this same graph. (Remember that the area of a triangle is 1/2 x base x height.) The value of her consumer surplus is the area of the green triangle, $4 high ($9 - 5) and a base of 4 (videotapes):
CS= 1/2 x 4 x 4 = $8.
Notice that we express consumer surplus as a monetary amount. This is important to remember, consumer surplus is a very real monetary measure of value.
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