Which of the following about demand is true?

a. The height of the demand curve for a product at a given quantity represents the marginal value derived by the consumption of that unit.
b. The height of the demand curve for a product at a given quantity reflects the total value consumers derive from all units of the good consumed.
c. The total area above the demand curve for a product is equal to consumer surplus.
d. At every quantity, the height of the demand curve for a product represents the cost of producing that unit.


A

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