Portfolio correlation measures how two or more assets in your investment portfolio move in relation to each other. For example, if Apple stock and Microsoft stock tend to move up and down together, they are positively correlated.
Deep Dive
Portfolio correlation is quantified by a coefficient ranging from -1 to +1. A correlation of +1 means assets move perfectly in the same direction, -1 means they move perfectly in opposite directions, and 0 means there's no linear relationship. For instance, if a trader holds a portfolio heavily weighted in tech stocks (often highly positively correlated), adding a commodity like gold (which historically can be negatively or lowly correlated with equities) can reduce the overall portfolio risk. When the tech sector faces a downturn, gold might hold its value or even increase, offsetting some of the losses from the tech holdings, thus smoothing out portfolio returns and reducing overall volatility.
Why It Matters
Understanding portfolio correlation is crucial for effective risk management, as it directly impacts your portfolio's overall volatility and diversification. Ignoring correlation can lead to a portfolio where all assets move in the same direction, significantly amplifying losses during market downturns and hindering stable long-term growth.
Related Terms
- Volatility — The degree of variation in an asset's price over time. High volatility means large price swings, low volatility means smaller movements.