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This paper assesses the relative effectiveness of central bank independence versus policy rules for the policy instruments in bringing about good economic performance. It examines historical changes in (1) macroeconomic performance, (2) the adherence to rules-based monetary policy, and (3) the degree of central bank independence. Macroeconomic performance is defined in terms of both price stability and output stability. Factors other than monetary policy rules are examined. Both de jure and de facto central bank independence at the Fed are considered. The main finding is that changes in macroeconomic performance during the past half century were closely associated with changes the adherence to rules-based monetary policy and in the degree of de facto monetary independence at the Fed. But changes in economic performance were not associated with changes in de jure central bank independence. Formal central bank independence alone has not generated good monetary policy outcomes. A rules-based framework is essential.