The horizontal axis of the graph shows the quantity of units sold in a day. It ranges from 0 to 15 in increment of 5. The vertical axis shows the price per unit in dollars. It ranges from 0 to 60 in increment of 10. A line labeled as S is drawn diagonally upward starting at a point close to x =4. Another line labeled as D0 is drawn diagonally downward starting at a point close to y=30. These two lines intersect at a point whose coordinates are (5,20).
A third line is drawn diagonally downward starting at a point close to y=50. This line is labeled as D1. The line D1 intersects the line S at a point whose coordinates are (7,40).
The difference in price value between the two intersections on the S curve is 20 dollars. This value is labeled on the ...
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