Suppose that Amber's demand for gasoline is given by G = 1000 - 200PG, where G stands for gallons of gas and PG represents the price of gas. (a) Suppose gas sells for $2 per gallon. What is Amber's consumer surplus? Illustrate your answer graphically. (b) Suppose the price of gas rises to $3 per gallon. What is the change in Amber's consumer surplus? Illustrate this change in your graph

What will be an ideal response?


(a) Amber's demand curve is shown in Figure 6.12. When gas sells for $2 per gallon, Amber's consumer surplus is (1/2) × $2 × 600 = $900. This is shown as the area of triangle $5$2a.



(b) When PG = $3, consumer surplus is (1/2) × $2 × 400 = $400. So Amber's consumer surplus falls by $500. This is represented by the area of the rectangle $3$2cb plus the area of the triangle abc in Figure 6.12.



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