Mandates and Frameworks: Price Stability, the Dual Mandate and Why 2 Percent

What you will learn

• How a hierarchical mandate differs from a dual mandate.
• How the ECB, the Fed and the Bank of England define price stability in 2026.
• What inflation targeting and average inflation targeting are, and why the Fed dropped averaging.
• Why major central banks aim at 2 percent rather than 0 percent.

Explanation

The basic roles of the ECB and the Fed were introduced in the macro course ("Interest Rates and Central Banks: ECB and Fed"). Here we go deeper into goals, frameworks and the logic behind the numbers.

Mandates

A mandate is the goal set by law:

• Hierarchical mandate: price stability first; other goals only if price stability is not at risk. The European Central Bank (ECB) and the Bank of England (BoE) work this way.
• Dual mandate: two goals of equal legal rank. The US Congress charges the Federal Reserve (Fed) with "maximum employment" and "stable prices".

The mandate says what; the framework (strategy) is the bank's own document saying how: which index, which number, which horizon.

Three definitions of price stability

• Symmetric: inflation of 1% is as unwelcome as 3%. Until 2021 the ECB aimed at "below, but close to, 2%", which markets read as a ceiling. The 2025 strategy assessment confirmed the symmetric 2% target.
• Medium term: the ECB does not try to hit 2% every month; it can accept a temporary overshoot after an energy shock.
• The Fed targets PCE, not CPI (see the course "Reading Economic Data Releases"); markets watch CPI because it comes first.

Inflation targeting and the Taylor rule

Inflation targeting means announcing a numerical goal and moving the policy rate so that forecast inflation returns to it.

A useful benchmark is the Taylor rule (1993):

i = r* + π + 0.5 × (π − π*) + 0.5 × output gap

i is the policy rate, r the neutral real rate (neither stimulating nor restraining), π inflation, π** the target and the output gap the distance of output from potential in percent. No central bank follows it mechanically, but it is a good test of whether policy looks tight or loose.

Average inflation targeting

In August 2020 the Fed adopted flexible average inflation targeting (FAIT): after a period below 2%, it would aim moderately above 2% "for some time" so that inflation averages 2%. This is a makeup strategy: past misses are compensated. The 2021–2022 inflation surge made the idea irrelevant; in August 2025 the Fed removed the averaging language and the one-sided focus on employment "shortfalls". It returned to flexible inflation targeting with a "balanced approach" to both goals and kept the 2% PCE objective; it now reviews the framework about every five years, so check the current statement.

Why 2 percent and not 0?

• Measurement bias: price indices slightly overstate true inflation (slow adjustment for quality and substitution).
• Buffer against the zero lower bound: nominal rates stay high enough that the bank can cut meaningfully before reaching zero.
• Wage adjustment: nominal wages rarely fall; a little inflation lets real wages adjust without nominal cuts.

No major central bank has changed its number: that would damage credibility.

Worked example

Hypothetical example: all numbers are invented.

Inflation ran at 1% a year for three years, so the price level rose to 1.01³ = 1.0303. A 2% path over six years would reach 1.02⁶ = 1.1262. To average 2% over six years, the next three years must deliver (1.1262 ÷ 1.0303)^(1/3) − 1 ≈ 3.0% per year. A pure inflation targeter would simply aim at 2% again (price level 1.0303 × 1.02³ = 1.0934). The gap of about 3 points of price level is what makes makeup strategies controversial once inflation is high.

Exclusions: forecast errors, data revisions and policy lags are ignored.

Common mistake

Practice activity

On paper: a hypothetical central bank has r* = 0.5%, inflation 2.4%, target 2% and an output gap of +0.5%. (a) Calculate the Taylor-rule rate. (b) The actual policy rate is 2.75%. Is policy tight or loose relative to the rule, and by how much? (c) Name one reason the bank might deliberately stay away from the rule rate.

Key takeaways

• The mandate is set by law; the framework (index, number, horizon) is written by the bank itself, except in the UK.
• The ECB targets 2% HICP symmetrically over the medium term; the Fed targets 2% PCE under a dual mandate; the BoE targets 2% CPI set by the government.
• Average inflation targeting is a makeup strategy; the Fed used it from 2020 and dropped it in 2025.
• 2% balances measurement bias, a buffer against zero rates and credibility.

Next step

Next we open the toolbox: corridor and floor systems, standing facilities and how the policy rate reaches the money market.