Advanced Trading · Liquidity and Structure, Revisited
Correlation: When Two Assets Move Together (or Don't)
What You'll Learn
- What correlation refers to between two assets
- The basic idea behind positive and negative correlation
- Why correlation matters when holding more than one position at once
The Big Idea
This is the final lesson of this module. Let me teach you correlation: the tendency of two assets' prices to move in relation to each other. Positively correlated assets tend to move in the same direction together. Negatively correlated assets tend to move in opposite directions. Understanding this becomes especially important once more than one position is held at the same time.
Let's Break It Down
Positive correlation means two assets have historically tended to rise and fall together, broadly moving in the same direction at similar times. Negative correlation means the opposite — one has historically tended to rise when the other falls. Some pairs of assets show little consistent relationship either way.
This connects directly to the risk sentiment concept from Fundamental & Market Analysis. Assets that respond similarly to the same broader risk-on or risk-off shifts often show positive correlation with each other, since they are being pushed by some of the same underlying broader forces.
Correlation becomes especially important once you hold more than one position simultaneously. Two highly correlated positions can behave, in combination, much more like one larger position than two genuinely separate ones — a distinction that becomes directly relevant to the portfolio concepts I cover later in this course.
Real Example
Two umbrella companies in the same city likely see similar demand swings tied to the same local weather — highly, or positively, correlated. An umbrella company and a sunscreen company in that same city might see the opposite pattern instead — negatively correlated, since favorable conditions for one tend to be unfavorable for the other.
Why It Matters
Understanding correlation is essential before the portfolio concepts lesson later in this course, since holding multiple positions that are actually highly correlated with each other provides less genuine diversification of risk than it might initially appear to on the surface.
Common Mistake
Please do not assume that holding several different assets automatically spreads out risk. If those assets are highly correlated with each other, they can behave, in combination, much more like a single concentrated position than genuinely separate, independent ones.
Quick Check
What does positive correlation between two assets mean?
Key Takeaways
- Correlation describes the tendency of two assets to move in relation to each other — positively, negatively, or without a consistent pattern.
- Assets responding to similar broader risk sentiment, from Fundamental & Market Analysis, often show positive correlation.
- Holding multiple highly correlated positions provides less genuine diversification than it might appear to on the surface.
Finished reading?
Mark this lesson as complete to track your progress.