Each of the Following Is Something That Economists Know About

Each of the following is something that economists know about the making of macroeconomic policy except

A) that shifts in economic policy have certain and immediate effects on spending.
B) that controlling inflation can be accomplished at low cost if and only if investors, managers, and . workers have confidence in the central bank's commitment to control inflation.
C) that automatic stabilizers are important factors that help eliminate the need for discretionary stabilization policy.
D) that a good macroeconomic policy that seeks to avoid unnecessary unemployment and inflation must walk a fine lines.