What it means
Watch markets long enough and patterns repeat across them: bond yields rise before stock valuations wobble, commodities surge before inflation data confirms it, currencies shift before trade flows explain why. Intermarket analysis is the discipline of treating these links as information, using one market's behaviour as a clue to another's next move.
The intellectual foundation is economic, not mystical. The same growth, inflation, and policy forces drive all asset classes at once, so prices across markets should rhyme.
When they stop rhyming, something has changed, and the analyst's job is figuring out which market is telling the truth early. The field's modern codification came from technical analyst John Murphy, whose work from the 1990s onward mapped the classic relationships: bonds leading stocks at turns, commodities confirming inflation regimes, the dollar steering commodity prices.
The CMT Association, the technical analysis profession's body, continues to teach and host his intermarket framework. The classic relationships have a logic worth knowing.
Falling bond prices with rising yields often pressure stocks, because discount rates rise; a weakening currency tends to lift that country's commodity-linked and export sectors; rising commodities eventually feed inflation, which circles back to bonds. The framework's honest weakness is instability.
Correlations that held for a decade can invert in a new regime, as stock-bond correlation did when inflation returned in the 2020s, flipping from negative to positive. Intermarket signals are regime-dependent hypotheses, not laws of physics.
Practitioners use it two ways. Top-down traders read cross-market divergences for positioning, like commodities breaking out while inflation-linked bonds lag; portfolio managers use it as a regime check, asking whether their allocation assumptions still match what related markets are doing.
For non-trading managers, the lens still pays. Your input costs, borrowing rates, currency exposure, and equity valuation are one system; watching how they move together beats watching each alone, especially at turning points when the data arrives late but the markets do not.
The durable takeaway: intermarket analysis treats markets as one organism with four pulse points. Learn the classic relationships, track when they break, and remember that a broken correlation is itself the signal: the regime is changing.
In practice
Real-world examples.
Example
An analyst notices copper and other industrial commodities rising for months while bond yields stay flat, and positions for the yield rise that historically follows commodity-led growth signals, which arrives the next quarter.
Example
A portfolio manager sees stocks and bonds falling together, the inflation-regime signature, and shifts diversification from nominal bonds toward commodities and inflation-linked securities instead.
Example
A currency trader watches the local currency weaken while the country's commodity exports surge, a divergence suggesting the currency is underpricing the trade windfall, and buys it ahead of the data.
Formula
Calculation
No formula. Working tool: rolling correlation between asset-class return series over 60 to 120 days, watched for sign flips and divergence from the assumed regime relationship, such as the stock-bond correlation flipping positive in inflation regimes.
Worked example showing why the sign matters, using assumed figures. A fictional 60/40 portfolio holds stocks with 15% annual volatility and bonds with 6%. Portfolio variance = (0.6 x 15)^2 + (0.4 x 6)^2 + 2 x 0.6 x 0.4 x correlation x 15 x 6 = 81 + 5.76 + 43.2 x correlation.
- With a stock-bond correlation of -0.3, variance = 86.76 - 12.96 = 73.80, so volatility is about 8.6%.
- With a correlation of +0.5, variance = 86.76 + 21.60 = 108.36, so volatility is about 10.4%.
The same weights carry nearly two percentage points more risk once the correlation flips positive, which is the kind of regime change an intermarket check is designed to catch.Case study
Seen in the real world.
Fictional example: Vireo Capital, a fictional multi-asset fund, runs its allocation on the post-2000 assumption that bonds hedge stocks. Its risk officer, applying intermarket analysis, flags that commodities, inflation expectations, and the stock-bond correlation have all flipped together, the pattern Murphy's framework associates with an inflationary regime. The fund cuts nominal bond duration, adds inflation-linked debt and commodity exposure, and documents the reasoning for its board. When inflation data surprises upward and stocks and nominal bonds fall in tandem, the repositioned book holds up, and the correlation dashboard becomes a permanent agenda item.
Watch out
Common mistakes.
- Treating correlations as permanent laws. Intermarket relationships are regime-dependent and invert when macro conditions change; the stock-bond correlation flip of the 2020s punished anyone who assumed otherwise.
- Reading one divergence as destiny. A single market pair disagreeing is a question, not an answer; confirmation across several relationships, plus a story for why, separates signal from noise.
- Confusing intermarket analysis with data mining. With enough pairs and windows, some correlation always appears; the discipline's value comes from economic logic, the framework John Murphy codified, not from backtest fishing.
Questions
People also ask.
What is intermarket analysis?
The study of relationships between asset classes, stocks, bonds, currencies, commodities, using one market's moves as evidence about others, on the premise that shared economic drivers make their behaviour rhyme.
Who developed the framework?
Technical analyst John Murphy codified the modern version from the 1990s onward, mapping relationships like bonds leading stocks and the dollar steering commodities. The CMT Association continues to teach his intermarket work.
What is its main limitation?
Regime instability. The classic relationships invert when macro conditions shift, as the stock-bond correlation did when inflation returned in the 2020s. Signals must be re-validated against the current regime, not assumed.
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