What Is Inflation?
Inflation is the sustained increase in the general level of prices for goods and services over time.
When inflation rises, the purchasing power of money generally falls. In simple terms, the same amount of money buys fewer goods and services than it did before.
For traders, however, the most important question is not simply:
The more important questions are: Is inflation accelerating or slowing? Is inflation above or below expectations? What does it mean for central-bank policy? And how are bond yields and currencies responding?
This is where inflation becomes a market-moving fundamental indicator.
Why Inflation Matters to Traders
Inflation is one of the most important variables in macroeconomic analysis because central banks closely monitor it when determining monetary policy.
When inflation remains persistently high, a central bank may maintain restrictive monetary policy or raise interest rates to reduce demand.
When inflation falls sufficiently, the central bank may have more room to lower interest rates or adopt a less restrictive policy.
How Inflation Is Measured
Inflation can be measured using several different indicators. The two most important categories for traders are CPI and PPI.
Consumer Price Index — CPI
CPI measures changes in the prices consumers pay for a basket of goods and services.
- Food
- Energy
- Housing
- Transportation
- Healthcare
- Clothing
- Recreation
- Other consumer goods and services
CPI is one of the most closely watched inflation indicators because it provides a broad picture of changes in consumer prices.
Producer Price Index — PPI
PPI measures changes in prices received by producers for goods and services.
It can provide information about inflationary pressure earlier in the production process.
Traders sometimes monitor PPI for clues about future inflationary pressure. However, PPI should not be treated as a guaranteed predictor of CPI.
Headline Inflation vs Core Inflation
Headline Inflation
Headline inflation includes the full basket of goods and services measured by the inflation index.
This means it can be significantly affected by volatile components such as energy and food.
Core Inflation
Core inflation removes certain volatile components, most commonly food and energy, in an attempt to provide a clearer view of underlying inflationary pressure.
Why This Matters
A large increase in headline inflation caused by energy prices may tell a different story from broad-based increases across services, housing and other categories.
Inflation Rate vs Inflation Change
Traders should pay attention not only to the level of inflation, but also to its direction.
| Month | Inflation |
|---|---|
| January | 3.0% |
| February | 3.2% |
| March | 3.5% |
| April | 3.8% |
In this example, inflation is accelerating.
| Month | Inflation |
|---|---|
| January | 5.0% |
| February | 4.7% |
| March | 4.3% |
| April | 4.0% |
Here, inflation is still high, but it is decelerating.
Key Point
Markets are forward-looking. A currency can strengthen when inflation is high if traders expect a more aggressive central bank. Conversely, a currency can weaken while inflation remains elevated if markets begin pricing future rate cuts.
Inflation Expectations Matter
Markets do not wait for inflation to be released before forming expectations. Economists, banks, investors and traders develop forecasts before the release.
Therefore, the market reaction depends heavily on the difference between actual inflation and expected inflation.
Example
| Data | Value |
|---|---|
| Forecast CPI | 3.0% |
| Actual CPI | 3.5% |
| Surprise | +0.5 percentage points |
This represents a positive inflation surprise. Markets may interpret it as evidence that inflation is stronger than expected.
The Inflation → Interest Rate Relationship
This is one of the most important relationships in fundamental trading.
Suppose inflation remains persistently above a central bank's desired level. The central bank may become more concerned about inflation becoming entrenched.
Important
This relationship is not automatic. If inflation rises because the economy is weakening severely, markets may instead become concerned about stagflation.
Inflation and Bond Yields
Bond yields are extremely important when interpreting inflation releases.
This is why inflation should not be treated as an isolated number. Traders should monitor inflation alongside bond yields and monetary policy expectations.
Inflation and Forex
Inflation can affect currencies through monetary policy expectations. However, forex trading is relative. A currency should be compared against the economic and monetary conditions of the other currency in the pair.
| Country A | Country B |
|---|---|
| Inflation rising | Inflation falling |
| More hawkish expectations | More dovish expectations |
| Yields rising | Yields falling |
| Potential currency strength | Potential currency weakness |
Inflation and Gold
Gold requires additional consideration. Because gold does not pay interest, its relative attractiveness can be influenced by real yields and opportunity costs.
Important Misconception
High inflation does not automatically mean gold will rise. If inflation causes yields and real yields to increase significantly, gold can come under pressure.
Inflation and Equities
The relationship between inflation and equities is also more complicated than simply saying "high inflation equals stocks down."
- Interest-rate expectations
- Corporate costs
- Consumer demand
- Profit margins
- Equity valuations
- Monetary policy
Unexpectedly high inflation can cause markets to price higher interest rates, which can pressure equity valuations.
Inflation and Commodities
Commodities can both cause and respond to inflation.
This creates an important feedback loop between commodity markets and inflation.
The Importance of Inflation Components
Don't only look at the headline number. Ask what is actually driving the change.
How StarEdGE Can Analyze Inflation
StarEdGE can help traders move beyond individual economic releases by combining inflation with other fundamental variables.
This provides a broader picture of the fundamental strength or weakness of an economy.
StarEdGE Principle
One inflation release should not determine an entire trade thesis. Use inflation as one component of a broader macroeconomic framework.
Inflation Trading Framework
Example: Hotter-Than-Expected Inflation
| Indicator | Result |
|---|---|
| Forecast CPI | 2.8% |
| Actual CPI | 3.2% |
| Surprise | Positive |
Do not immediately buy the currency. Instead investigate core inflation, bond yields, central-bank expectations, positioning and technical structure.
Example: Lower-Than-Expected Inflation
| Indicator | Result |
|---|---|
| Forecast CPI | 3.0% |
| Actual CPI | 2.5% |
| Surprise | Negative |
The market may interpret this as reduced inflation pressure and potentially greater room for monetary easing. However, the reaction still depends on expectations and positioning.
Common Mistakes Traders Make
Trading the headline number
A trader sees CPI above expectations and immediately enters a trade.
Ignoring bond yields
Inflation and interest-rate expectations are closely connected, so yields provide important confirmation.
Assuming high inflation is always bullish for a currency
The broader economic and monetary-policy environment determines how markets interpret inflation.
Ignoring positioning
If traders are already heavily positioned for a hawkish outcome, even strong inflation may produce a limited reaction.
Trading without technical confirmation
A fundamental thesis can be correct while the entry timing is poor.
Key Takeaways
The StarEdGE Framework
Inflation tells you what is happening to prices. Economic surprise tells you whether the result was better or worse than expected. Bond yields tell you how markets are interpreting the inflation outlook.