Why is credibility important for implementing a monetary policy rule such as the Taylor rule?

• A. Credibility affects how the public forms expectations, which influences the effectiveness of policy responses to shocks
• B. Credibility has no impact
• C. Credibility only matters for fiscal policy
• D. Credibility affects only exchange rates

Answer: (A)

Credibility matters because monetary policy mostly works through expectations. If the central bank is believed to follow a rule like the Taylor rule, people form inflation and interest-rate expectations that align with that rule. That expectation anchoring makes policy more effective: inflation stays closer to target, real interest rates behave as intended, and the economy responds to shocks in a more predictable, stable way. When credibility is weak, people anticipate the central bank might not keep its promised path, wages and prices adjust higher or lower accordingly, and the stabilizing power of the rule weakens. In short, credibility shapes how the public forms expectations and, in turn, how policy responses to shocks actually play out.