Why Central Banks Target 2 Percent Inflation - and What Follows

Why Have an Explicit Target at All

Anchoring expectations: If households and firms believe inflation will return to a known number, they build that number into wage and price decisions, which helps make it true.
Solving time inconsistency: A public commitment makes it costlier for a central bank to deliver short-run stimulus at the expense of longer-run price stability.
Accountability: A number gives legislatures and the public a concrete standard against which to judge an unelected institution.
Cheaper disinflation: When expectations are anchored, bringing inflation back down requires a smaller sacrifice in output and employment.
Clearer communication: A published objective makes forward guidance intelligible, because markets can judge policy against a stated goal.

Room to cut rates: Positive trend inflation keeps nominal interest rates above zero in normal times, preserving space for conventional easing in a downturn.
A buffer against deflation: Aiming at zero means ordinary forecast errors would regularly produce falling prices, which raise real debt burdens and encourage delayed spending.
Measurement bias: Price indexes tend to overstate true inflation somewhat because they capture quality improvements and substitution imperfectly, so measured 2 percent implies lower true inflation.
Greasing relative wage adjustment: Nominal wages rarely fall outright, so mild inflation lets real wages adjust across industries without nominal pay cuts.
International convention: Most advanced-economy central banks converged on 2 percent, which itself helps anchor cross-border expectations.

Stable long-run inflation expectations: Survey and market-based measures tend to stay near the target even when current inflation moves well away from it.
Lower and less volatile inflation: Advanced economies that adopted targets in the 1990s generally saw both the level and the variability of inflation fall.
A flatter short-run trade-off: Anchored expectations mean supply shocks pass through to persistent inflation less readily.
More predictable policy: Markets can infer the likely reaction to news, which does part of the central bank's work for it.
Room for flexibility: Because the target is defined over the longer run, the committee can look through temporary shocks rather than reacting to every monthly reading.

The number is a convention: There is no deep theoretical derivation of 2 percent, and economists have argued at various times for both higher and lower figures.
Supply shocks are awkward: When an oil or supply-chain shock raises prices and lowers output at once, the two halves of the mandate point in opposite directions.
Asset prices are not in the index: A framework focused on consumer prices can miss financial imbalances building elsewhere.
The lower bound constrains it: If the neutral real interest rate is low, a 2 percent target may not leave enough room to cut in a severe recession.
Measurement matters: Which index is targeted, and whether headline or core is emphasised, changes what the same nominal target actually requires.