单项选择题

For a natural monopoly, the optimal policy for a regulator to set is a price such that: () 　

A．The price level equals marginal cost.
B．The price level equals average variable cost.
C．The price level equals average total cost but higher than marginal cost.
D．The price level is lower than marginal cost but higher than average total cost.

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单项选择题If AD shifts to the right to adapt to oil shocks from OPEC, then: ()

A．P and GDP will remain normal automatically.
B．GDP may be unchanged although P will rise.
C．GDP will rise and P will drop.
D．The domestic P of oil will drop.

单项选择题Suppose the economy is running at the level of potential GDP, an increase in government spending in the long run will ___ the price level and ___ the output level,

A．Increase, not change
B．Increase, increase
C．Increase, decrease
D．Decrease, increase