c10

c20

c30

c40

P

Q

Investment

Consumer Surplus

Producer Surplus

Total Surplus

Example 1

10

11

15

16

−

+

+

+

+

+

Example 2

16

15

11

10

−

+

+

+

−

+

Example 3

33

32

11

10

−

+

−

+

−

−

Example 4

10

30

12

13

−

+

+

+

−

−