Why a number released at 1:30pm UK time can move a currency in seconds: what the big reports measure, why the surprise matters more than the figure, and which popular rules of thumb hold up.
A currency is, in effect, the price of holding one country's money. If you can earn more interest in one currency than another, for similar risk, money tends to drift towards the higher rate. Central banks set the short-term interest rate, and markets spend their time guessing where those rates will go next.
A currency usually moves when those guesses change, not when the rate itself changes. By the time a bank announces a move everyone expected, it's already in the price. Data matters because it's the raw material for the guesses. You can see where each bank stands on our central bank rates page.
Most of the reports that move currencies fall into three areas, and the central bank's own words form a fourth.
| Area | What it tells you | Reports you'll see | Looks back or ahead? |
|---|---|---|---|
| Growth | How fast the economy is expanding | GDP (quarterly), purchasing managers' surveys (PMIs, monthly), retail sales, industrial production | GDP looks back. PMIs are an early hint. |
| Inflation | How fast prices are rising | Consumer prices (CPI, monthly), the US Fed's preferred gauge (PCE), producer prices (PPI), wage growth | CPI and PCE look back. PPI and surveys can hint at what's coming. |
| Jobs | How healthy the labour market is | US non-farm payrolls (usually the first Friday of the month), the unemployment rate, wage growth, weekly jobless claims | Payrolls look back. Weekly claims are the most up to date. |
| Policy | What the central bank is doing and saying | Rate decisions, meeting minutes, speeches, press conferences | Forward-looking: the bank is telling you what it plans. |
Headline versus core. You'll often see two versions of inflation. Headline includes everything. Core leaves out food and energy, which swing wildly. Central banks usually care most about the underlying trend, so core is watched closely, though headline can still move markets. In the US, CPI tracks a basket of what consumers buy, with weights that change slowly. PCE is broader and adapts faster as spending shifts, and it's the gauge the Fed targets.
Some reports describe the past. GDP and CPI are official scorecards, published weeks after the period they cover. Others are early hints: purchasing managers' surveys ask businesses about orders and prices right now, and producer prices show costs building before they reach shoppers.
Markets react to the hints first, and the scorecards then confirm or contradict them. A scorecard that matches what the hints suggested usually does little. One that contradicts them is a surprise, and that's what moves the price.
Before each release, economists publish a forecast, and the market price already reflects it. So the question isn't whether jobs growth was strong. It's whether it was stronger than expected.
| Illustrative example | Compared with forecast | What the currency tends to do |
|---|---|---|
| Forecast 180K jobs, actual 220K | Beat | Tends to rise: rate rises look more likely |
| Forecast 180K jobs, actual 180K | In line | Often little, because the price already reflected it |
| Forecast 180K jobs, actual 140K | Miss | Tends to fall: rate cuts look more likely |
Invented numbers to show the idea, not a real release.
The same number can push a currency in different directions depending on the backdrop. When a central bank is fighting inflation, strong jobs and wage data can mean higher rates, which tends to support the currency. When the worry is a slowing economy, strong data can be welcomed as lowering recession risk, and weak data can be read as a sign that rate cuts are coming.
Shares can react differently from currencies too: weak data sometimes lifts stocks because cuts look more likely, while the currency falls. There's no fixed rule, which is why the best guide is what the central bank itself says it's watching. Its latest statement and press conference usually show which number it cares about most, and that can change from one year to the next.
A 2-year government bond yield is the market's estimate of where short-term interest rates will average over the next couple of years, so it moves when data changes expectations. Traders compare two countries' yields: if one country's 2-year yield rises faster than the other's, the gap favours its currency.
It explains the month it changes in, because yields and currencies react to the same news. But the change in the gap told us nothing about the next month. See the test →
Holding the higher-yielding currency earns real interest, but currency moves took back a large part of it. See the carry test →
Both results point the same way: data explains moves that have happened far better than it forecasts the next one. Every currency pair page now shows its own yield gap.
These get repeated a lot. Some hold up well and some don't.
| The rule | The reality check |
|---|---|
| “The market trades the surprise.” | Broadly true for scheduled data, and it's the idea behind the forecast column on any calendar. We'd like to test it properly, but that needs years of forecasts and actual results, and there's no free source for that yet. |
| “Higher interest rates mean a stronger currency.” | Often in the short run, when rates rise by more than expected. Over longer periods it's less reliable, because higher rates can also slow growth. In our carry test, currency moves took back a large part of the interest. |
| “Two negative quarters of GDP means a recession.” | A common shorthand, and the official “technical recession” label in some countries, but not a universal definition. The US, for example, leaves the call to a committee that looks at a broad set of evidence. |
| “Unemployment above 5% means recession.” | There's no such rule. Economists watch how quickly unemployment is rising rather than a fixed level. One well-known gauge, the Sahm rule, signals trouble when the three-month average US unemployment rate climbs half a percentage point above its lowest level of the past year. It was built on US data and isn't a guarantee. |
| “Bad news is good news.” | Sometimes: weak data can lift shares when it raises hopes of rate cuts. It depends on whether markets are more worried about inflation or growth, and it can flip. |
| “The yield gap tells you where a currency is heading.” | It moves with the currency, but it doesn't lead it. See our test. |
Economic calendar: forecasts, previous figures and the latest results
Central bank rates: where each bank stands
Currency pairs: each pair's rate gap and bond-yield gap
There's no single one. The most market-moving reports are usually the ones closest to what central banks are focused on, which in recent years has often been inflation (CPI, PCE) and jobs (US non-farm payrolls). That changes with the economy, so check what the bank itself says.
No. A strong number tends to help when it makes higher interest rates more likely, but the reaction depends on the forecast and on what the central bank is worried about.
Sometimes seconds, and sometimes they reshape the trend for weeks. The first spike often partly reverses.