Central banks have long sought effective frameworks to guide monetary policy decisions, particularly those concerning interest rates in response to inflation and economic output. Among the most influential tools in this context is the Taylor Rule, first introduced by John B. Taylor in 1993. This rule offers a simple formula for setting the policy interest rate based on the deviation of inflation from its target and the output gap—the difference between actual and potential economic output.

Despite its apparent simplicity, the Taylor Rule has served as a critical benchmark for many central banks, including the U.S. Federal Reserve, the European Central Bank (ECB), and central banks in emerging markets.

Traditionally, the Taylor Rule suggests a symmetric response to inflation, regardless of its origin. However, modern macroeconomic theory and recent empirical evidence challenge this assumption. Notably, the Federal Reserve’s official communications and meeting transcripts indicate an increasing awareness of the difference between demand-driven and supply-driven inflation. Demand-driven inflation results from excessive aggregate demand, often warranting a forceful monetary response. In contrast, supply-driven inflation—such as that caused by oil price shocks or supply chain disruptions—typically entails a trade-off between controlling inflation and preserving employment, prompting a more cautious policy approach.

Recent research by Hofmann, Manea, and Mojon (2025) provides strong empirical support for what they term the “Targeted Taylor Rule.” This refined rule modifies the standard approach by allowing the central bank to respond differently to inflation based on its underlying drivers. Their analysis shows that the Federal Reserve has historically responded nearly four times more aggressively to demand-driven inflation than to supply-driven inflation. This differentiated response aligns with optimal policy prescriptions derived from New Keynesian models, where strict inflation targeting is most effective against demand shocks but may be counterproductive in response to supply shocks.

Simulations using the New Keynesian framework demonstrate that following a targeted Taylor Rule results in more stable output and a better approximation of welfare-maximizing policy. Under this approach, inflation is allowed to fluctuate more in response to supply shocks, while demand shocks are met with stronger interest rate adjustments. The study also reveals that central banks can, in practice, infer the nature of inflationary shocks through a combination of real-time data, sectoral analysis, and expert judgment, even in the absence of formal decomposition tools.

These findings have significant implications for central banks globally. In emerging markets such as Brazil and Chile, inflation-targeting regimes already reflect some flexibility akin to targeted responses. The Bank of Japan, dealing with persistent deflation, has relied heavily on unconventional tools, highlighting the limitations of conventional Taylor-type rules under zero lower bound. The ECB faces the unique challenge of setting policy for a diverse group of member states, where a one-size-fits-all approach may not suffice, especially when inflation pressures differ across the euro area.

The rise of the targeted Taylor Rule marks an important evolution in monetary policy thinking. While simplicity and transparency remain valuable, a more nuanced, state-contingent approach can enhance policy effectiveness in a world characterized by complex, multi-causal economic shocks.

Central banks may not formally adopt such rules, preferring discretion and flexibility, but as a benchmark for policy deliberation and communication, the targeted Taylor Rule offers a significant step forward in aligning theory with practice.

Reference: Hofmann, Boris, Cristina Manea, and Benoît Mojon. Targeted Taylor Rules: Some Evidence and Theory. Bank for International Settlements, December 2024.Targeted Taylor rules: some evidence and theory