Part four of GO Markets' educational series, breaking down how inflation affects interest rates, purchasing power and financial markets.
You have seen it happen: a Consumer Price Index (CPI) number drops, and within seconds gold swings, the US dollar rallies and equities sell off. Wednesday morning, 8:30 am US Eastern time. The US CPI lands. Within ninety seconds, the US dollar has moved 40 pips. Bond futures are selling off. Gold has dropped US$15. Technology stocks are pointing sharply lower.
If you have watched CPI days and seen this unfold, you already know inflation matters to markets. What this article gives you is the chain. Understand the step-by-step mechanism that runs from a single number on a screen to repricing across asset classes, and CPI day starts to make more sense.
Many traders know interest rates matter, but struggle to explain why a rate hold, with no change at all, can still trigger sharp market volatility.
Inflation measures how fast prices are rising across an economy. Because rising inflation can change what central banks are expected to do with interest rates, it can move bonds, currencies, equities and commodities at the exact same time.
What inflation actually measures
In plain English, inflation is a sustained rise in the general level of prices across an economy. It is not one product getting more expensive. It is a broad, persistent upward trend in what goods and services cost.
That economic definition matters, but it is not what this article is about. What matters to traders is how inflation is reported, measured, and interpreted, because different measures carry different weight with the central banks that set interest rates.
Tracks the change in prices paid by households for a basket of goods and services. The headline number includes everything, including food and energy.
BLS (US)/ABS (AU)CPI with volatile food and energy stripped out. It is more representative of underlying trends. Central banks pay extremely close attention to core inflation.
PRIMARY FED FOCUSThe Federal Reserve’s preferred inflation measure. Broader than CPI and adjusts for changes in consumer behaviour. When the Fed talks about its 2% target, this is what it means.
FED'S OFFICIAL MEASURERemoves the most extreme price movements from both ends of the distribution, giving a cleaner picture of underlying inflation. The Reserve Bank of Australia uses this as its key measure.
RBA PRIMARY MEASUREThe most important distinction to understand immediately is headline CPI versus Core CPI. Headline includes food and energy, which are volatile. Petrol prices spike in a given month, headline CPI jumps. The following month, petrol falls, headline CPI retreats. Neither move necessarily tells a central bank anything useful about the underlying direction of inflation.
Core strips that volatility out and shows the trend beneath it. A core CPI beat, particularly one driven by services, tells a central bank something concrete about where inflation is heading. That is why traders focus heavily on core metrics.
Why inflation data moves financial markets
Inflation does not move markets directly. This is the most important concept to understand. The chain runs through interest rate expectations.
Here is the mechanism, step by step.
When inflation comes in hotter than expected, the market reads it as a signal that the central bank may need to hold rates higher for longer, or raise them further. Expectations for interest rate cuts get pushed further out. Money flows into higher-yielding assets and away from rate-sensitive ones.
When inflation comes in cooler than expected, the opposite chain runs. Rate cut expectations move forward. Bond yields fall. The dollar weakens. Rate-sensitive assets rally.
The 2022 to 2024 inflation cycle illustrated this mechanism with unusual clarity. Through 2022, US CPI readings came in repeatedly above expectations. The Federal Reserve raised the federal funds rate aggressively, from near zero in early 2022 to above 5% by mid-2023. Each hot CPI print reinforced expectations of further hikes, keeping bond yields elevated and pressuring equity valuations.
Markets are forward-looking. By the time a CPI number is released, economists, traders and algorithms have already formed expectations about what it will say. Those expectations are priced in. What moves markets is the gap between what was expected and what actually printed.
A CPI reading of 3.5% that matches the consensus of 3.5% may produce almost no market reaction. The same reading of 3.5% against a consensus of 3.2% can trigger a significant repricing across multiple asset classes. Nothing changed about the inflation level. What changed was the information the number contained.
What drives rate expectations
Rate expectations are constantly shifting. They are pushed and pulled by incoming economic data that forces traders to reassess what a central bank may do next.
Inflation runs hotter than expected, meaning central banks may need to hike more or hold higher for longer.
↓ Expectations fall:Inflation cools faster than expected, giving central banks room to cut.
THE MECHANISMInflation data is the primary input driving central bank interest rate decisions.
Employment is strong and wages rise, suggesting the economy can absorb higher rates.
↓ Expectations fall:Jobs weaken and unemployment rises, increasing pressure to support growth.
THE MECHANISMStrong jobs data (like Non-Farm Payrolls) can delay rate cuts, while weak jobs data brings cuts forward.
A governor flags inflation concern, hints at further hikes, or signals a longer hold.
↓ Expectations fall:A governor flags economic weakness or executes a dovish pivot.
THE MECHANISMMarkets often react more aggressively to policy guidance than to the decision itself.
The common trap is assuming that high inflation is always bad for markets, and that falling inflation is always good.
In 2022 and 2023, inflation was high and equities fell sharply because the Fed was raising rates aggressively. But in late 2023 and 2024, inflation was still above target and equities rallied. Why? Because inflation was falling faster than expected, which meant the market began pricing in rate cuts sooner than previously thought.
Inflation does not move markets directly. Its effect on rate expectations does.
Three scenarios, the surprise in context
How inflation data moves the markets you trade
Hot inflation data tends to send bond yields higher and bond prices lower as markets price in tighter central bank policy. The 2-year Treasury yield is especially sensitive to CPI surprises because it reflects near-term rate expectations most directly.
When inflation data matters most to traders
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US CPI releases: Published monthly by the Bureau of Labor Statistics. Core CPI is the number to watch. A beat or miss of 0.1% or more relative to consensus can produce a meaningful market reaction.
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US PCE releases: The Federal Reserve’s preferred inflation measure. It may create less volatility on release than CPI, but it is central to how the Fed frames policy decisions.
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Australian CPI and trimmed mean: The RBA focuses closely on trimmed mean CPI. Because Australian CPI has historically been released quarterly, each print carries the potential to shift RBA rate expectations meaningfully.
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Wage data: A leading indicator. Strong wage growth feeds into sticky services inflation. Watch US Non-Farm Payrolls average hourly earnings and Australian Wage Price Index releases.
Test your knowledge
Inflation does not move markets directly. What it implies for interest rates does.
Disclaimer: Articles are from GO Markets analysts and contributors and are based on their independent analysis or personal experiences. Views, opinions or trading styles expressed are their own, and should not be taken as either representative of or shared by GO Markets. Advice, if any, is of a ‘general’ nature and not based on your personal objectives, financial situation or needs. Consider how appropriate the advice, if any, is to your objectives, financial situation and needs, before acting on the advice. If the advice relates to acquiring a particular financial product, you should obtain our Disclosure Statement (DS) and other legal documents available on our website for that product before making any decisions.
