A Market with Constant Costs Is in Long-Run Equilibrium When

Multiple Choice

A market with constant costs is in long-run equilibrium when it experiences a permanent increase in demand.
In the short run,firms in the market ________.In the long run,some firms ________ the market.

A) make zero economic profit;exit
B) make an economic profit;enter
C) incur an economic loss;exit
D) make zero economic profit;enter
E) none of the above