If Sam is willing to pay $50 for one unit of good X, $30 for a second, $20 for a third, $8 for a fourth, and the market price is $10, then Sam's consumer surplus is:

A. $40 and he buys 1 unit of good X.
B. $60 and he buys 2 units of good X.
C. $70 and he buys 3 units of good X
D. $68 and he buys 4 units of good X.


Answer: C

Economics

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