A．it is harmful for a government to interfere with economic matters
B．state policies tend to lower profits and discourage investment
C．regulation may affect business operation by increasing the cost
D．most regulations are not meant for the protection of the public

A．Because no economist knows everything
B．Because it always follows a period of prosperity
C．Because there are too many reasons behind it
D．Because it is hard to predict when it will be coming

A．find the exact causes for economic decline
B．find ways to fight unemployment
C．work out all the factors that lead to economic prosperity
D．cooperate with businessmen and politicians