Why Do Central Banks Target 2% Inflation?

The most powerful number in the world economy is 2%. It decides, indirectly, what your mortgage costs, whether your employer gives you a raise, and how much your savings will buy in ten years. The central banks of the United States, the euro area, Britain, Canada, Australia, and dozens of other countries all aim at it. And here is the strange part: no scientific study ever proved that 2% is the right number. It began as a practical guess in a small country at the edge of the world — and then, because it worked, everybody copied it.

A number born on television

The story starts in New Zealand in the late 1980s. After years of double-digit inflation — prices rose by an average of nearly 12% a year through the 1980s, and by almost 19% at one point in 1987 — the country decided to try something new. The Reserve Bank of New Zealand Act of 1989 gave the central bank a single, clear job: keep prices stable. The bank’s governor and the finance minister would then agree a numerical target in a public document called a Policy Targets Agreement.

The number itself has a famously casual origin. In a television interview on 1 April 1988, finance minister Roger Douglas was pressed on inflation and said he wanted it down to no more than 1% a year within a couple of years. It was an off-the-cuff remark, not a researched proposal. But it stuck. When the first Policy Targets Agreement was signed in March 1990, it defined price stability as inflation between 0% and 2%, to be reached by December 1992. New Zealand had become the first country in the world to run monetary policy against an explicit numerical inflation target.

Other countries followed fast. Canada adopted inflation targeting in 1991, with a 2% midpoint. Britain followed in 1992, Sweden in 1993. The European Central Bank, created in 1999, defined price stability as inflation “below 2%” in 1998, refined that to “below, but close to, 2%” in 2003, and finally adopted a symmetric 2% target in July 2021. The US Federal Reserve was the latecomer: its policymakers had privately settled on roughly 2% by the mid-1990s, but they did not say so in public until January 2012, when the Federal Open Market Committee issued its first Statement on Longer-Run Goals and announced that “inflation at the rate of 2%, as measured by the annual change in the price index for personal consumption expenditures, is most consistent over the longer run with the Federal Reserve’s statutory mandate.”

So the 2% target was not handed down by economic theory. It was chosen because it looked low enough to count as price stability and high enough to be achievable — and then it spread because the countries that adopted it saw their inflation settle down. Imitation did the rest.

First, what is inflation targeting?

Before asking why 2%, it helps to see what the target actually does. Inflation is a rise in the general level of prices — not one thing getting expensive, but most things, on average, over time. A central bank cannot set prices directly. What it can do is set short-term interest rates, which ripple through the economy: mortgages, business loans, and savings rates all move in response.

Inflation targeting is a promise with a mechanism. The bank announces a number, explains how it will steer the economy towards it, and publishes forecasts and decisions so the public can check its work. If inflation drifts above target, the bank typically raises interest rates to cool spending. If it drifts below, it cuts rates to encourage it. The number matters less as a precise destination than as an anchor: if businesses and households believe prices will rise about 2% a year, they set wages, sign contracts, and make investment plans on that basis — and those decisions themselves help keep inflation near 2%. Economists call this anchored expectations, and it is the real engine of the system. A target that everyone believes in partly enforces itself.

That is also why central banks care so much about credibility. A target is only an anchor if people trust it. Break the promise too often, and the anchor drags.

Why not zero?

If rising prices erode your money, why not aim for zero inflation — perfectly stable prices? There are four good reasons, and together they explain why the target is small and positive rather than zero.

The buffer against deflation. Falling prices sound pleasant until you live through them. When prices fall, people postpone purchases, expecting things to be cheaper later. Spending drops, businesses cut back, wages fall, and debts become heavier in real terms, because you repay loans with money that is worth more than when you borrowed it. Economists call this a deflationary spiral, and Japan’s experience from the 1990s onwards — years of stagnant prices and weak growth — is the cautionary tale every central banker has in mind. A 2% target keeps the economy a safe distance from the edge of deflation. If a shock pushes inflation down by a couple of points, you land near zero, not below it.

Room to cut interest rates. Interest rates cannot easily go far below zero — nobody will lend money if they have to pay for the privilege beyond a point. This is the “zero lower bound.” Now think about real interest rates, which are nominal rates minus inflation. If inflation is 2% and the central bank sets its policy rate at zero in a recession, the real rate is minus 2%: borrowing is genuinely cheap, which stimulates spending. If inflation is 0%, a zero policy rate is just a zero real rate — the bank has no room left to make borrowing cheaper. A positive inflation target is, in effect, extra ammunition for recessions.

Measurement bias. Price indices are imperfect. They struggle to capture quality improvements — a laptop today is vastly better than one from ten years ago, but the index may record only its price — and they are slow to reflect shoppers switching to cheaper alternatives. A famous American study, the Boskin Commission of the mid-1990s, estimated that the US consumer price index overstated true inflation by about 1.1 percentage points a year. Later methods improved, but the bias has not vanished. Measured inflation of 2% probably means the true cost of living is rising by somewhat less — perhaps closer to 1%. Targeting measured zero would risk true deflation.

Sticky wages. Workers resist pay cuts far more fiercely than they resist their pay rising more slowly than prices. Economists George Akerlof, William Dickens, and George Perry argued in a well-known 1996 paper that a little inflation “greases the wheels” of the labour market: it lets employers reduce real wages where they need to, by giving smaller raises rather than imposing cuts, which avoids layoffs. At zero inflation, that flexibility disappears, and unemployment can end up permanently higher.

None of these arguments picks out exactly 2% rather than 1.5% or 3%. They point to “a small positive number.” Two percent was the number that happened to be available, and it was close enough.

The great test: 2021–2023

For about a decade after the 2008 financial crisis, the problem was the opposite one: inflation ran below 2% in many advanced economies, and central banks struggled to push it up. In August 2020, the Federal Reserve adjusted its framework to “flexible average inflation targeting,” saying that after periods of below-target inflation it would aim for inflation moderately above 2% for a time — trying to make up lost ground rather than treating bygones as bygones.

Then came the pandemic, supply-chain chaos, and the energy shock, and inflation surged far above target in 2021 and 2022. Central banks raised rates sharply, and inflation came back down. Critics asked whether the target itself should be raised — after all, if 2% was arbitrary, why not 3% or 4%? Former IMF chief economist Olivier Blanchard had already floated 4% after the 2008 crisis, arguing it would give central banks more room to cut rates in future recessions, and economist Laurence Ball made the full case in 2014. The counter-argument, which won, was about credibility: raising the target in the middle of an inflation surge would look like moving the goalposts because you were losing, and the anchor would slip. No major central bank changed its number. The debate did, however, leave a permanent mark: 2% is now defended as a choice, not treated as a law of nature.

Why this matters to you

The 2% target is not an abstraction. It shapes three things in ordinary life.

It shapes your pay. If your employer expects 2% inflation, a 2% raise keeps your purchasing power flat; anything less is a real cut. Wage negotiations everywhere are conducted in the shadow of that number.

It shapes your borrowing. Mortgage rates, car loans, and credit card rates all build on the central bank’s policy rate, which moves to defend the target. When the bank raises rates to fight inflation, your borrowing gets more expensive — that is the mechanism working as designed, and it is also why rate hikes feel painful.

And it shapes your savings. At 2% inflation, money left under a mattress loses half its purchasing power in about 35 years. That quiet erosion is the price of the system: the target is low enough that the erosion is slow, but it is never zero. Anyone saving for retirement is, whether they know it or not, racing against 2%.

What happens next

The 2% target will probably survive, but it will not go unchallenged. Central banks now review their frameworks every few years — the Fed’s review cycle is the model — and each review reopens the question. Three pressures are building.

First, the neutral rate of interest — the rate that neither stimulates nor restrains the economy — appears to have fallen over recent decades, which shrinks the room central banks have to cut rates in a recession. That strengthens the case for a higher target, or for new tools to substitute for rate cuts.

Second, climate change and the energy transition may make inflation more volatile, with supply shocks arriving more often. A framework built for a calmer era may need more flexibility about how fast it returns inflation to target after a shock.

Third, digital money and instant payments are changing how fast monetary policy reaches people. The mechanics may shift, even if the target does not.

Whatever changes, one lesson from New Zealand’s experiment is likely to endure: the power of a target lies less in the exact number than in the public promise around it. A central bank that says what it will do, explains itself, and is held to account gives households and businesses something they can plan around. That planning — millions of wage deals, contracts, and mortgages all assuming roughly stable prices — is the real achievement. The number 2% was a guess. The system built around it was not.

Sources

• Board of Governors of the Federal Reserve System, “Timeline: Statement on Longer-Run Goals and Monetary Policy Strategy”: https://www.federalreserve.gov/monetarypolicy/timeline-statement-on-longer-run-goals-and-monetary-policy-strategy.htm
• Federal Reserve Bank of San Francisco, “The Evolution of the FOMC’s Explicit Inflation Target”: https://www.frbsf.org/research-and-insights/publications/economic-letter/2019/04/evolution-of-fomc-explicit-inflation-target/
• Federal Reserve Bank of Richmond, “The Origins of the 2 Percent Inflation Target”: https://www.richmondfed.org/publications/research/econ_focus/2024/q1_q2_federal_reserve
• Te Ara, The Encyclopedia of New Zealand, “Central bank independence” (Reserve Bank history): https://teara.govt.nz/en/reserve-bank/page-3
• “Inflation targeting” (history and country adoption dates): https://en.wikipedia.org/wiki/Inflation_target