Environmental regulation has likely caused:
A.	the level of GDP to be greater than it would in the absence of such regulation.
B.	the level of GDP to be less than it would in the absence of such regulation.
C.	the level of GDP to be unaffected by such regulation.
D.	air quality to fall relative to what would exist in the absence of such regulation.
Answer:B
Environmental regulation has likely caused:
A.	the level of GDP to be greater than it would in the absence of such regulation. B.	the level of GDP to be less than it would in the absence of such regulation. C.	the level of GDP to be unaffected by such regulation. D.	air quality to fall relative to what would exist in the absence of such regulation.