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单项选择题

As the demand (marginal benefit) curve becomes less elastic, if the equilibrium price and quantity remain unchanged, consumer surplus:

A. decreases.
B. increases.
C. remains unchanged.
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单项选择题If the prices of substitute resources decreased, the demand for a given resource will most likely:

A. increase.
B. decrease.
C. remain unchanged.

单项选择题If a consumer is willing to pay $300000 for a house but only has to pay $240000, the $60000 difference is:

A. consumer surplus.
B. consumer deficit.
C. producer surplus.