What Is the Difference Between Systematic and Unsystematic Risk?
Systematic risk, also called market risk, refers to the risk inherent to the entire market or economy that affects nearly all investments simultaneously — such as recessions, interest rate changes, or geopolitical events — and cannot be eliminated through diversification. Unsystematic risk, also called specific or idiosyncratic risk, refers to risk unique to a particular company or industry — such as a product recall or a lawsuit — which can be substantially reduced by holding a diversified portfolio.
Why This Distinction Matters
This distinction forms a core principle of modern portfolio theory: because unsystematic risk can be diversified away essentially ‘for free’ by simply holding more securities, investors are generally not compensated with higher expected returns for taking on this type of risk. Systematic risk, however, cannot be eliminated no matter how diversified a portfolio becomes, which is why investors generally do expect additional compensation (higher returns) for bearing this undiversifiable risk.
Examples of Each Type of Risk
Systematic Risk Examples
Broad interest rate changes, inflation surges, recessions, and major geopolitical conflicts all represent systematic risks, as they tend to impact most companies and asset classes to varying degrees regardless of how well-diversified a portfolio is.
Unsystematic Risk Examples
A single company’s product failure, a management scandal, a factory fire, or a lawsuit specific to one business are all examples of unsystematic risk, since these events typically don’t meaningfully affect unrelated companies or the broader market.
| Risk Type | Can Diversification Reduce It? | Example |
|---|---|---|
| Systematic (Market) Risk | No | A recession affecting the entire economy |
| Unsystematic (Specific) Risk | Yes | A single company’s product recall |
Frequently Asked Questions
How is systematic risk measured?
Beta is the most common measure of a security’s exposure to systematic risk, indicating how sensitive an asset’s returns are to overall market movements — a beta above 1 suggests greater sensitivity than the market, while below 1 suggests less.
Can I eliminate unsystematic risk completely?
In practice, holding a sufficiently large and varied number of securities across different industries can reduce unsystematic risk close to negligible levels, though achieving absolute zero is generally considered practically unattainable.
Why don’t investors get paid extra for taking on unsystematic risk?
Financial theory holds that since unsystematic risk can be eliminated at essentially no cost through diversification, a rational market shouldn’t reward investors with extra return for bearing a risk that could have simply been avoided.
How many stocks are needed to substantially reduce unsystematic risk?
While the exact number depends on the correlation between holdings, academic research has often suggested that a portfolio of around 20 to 30 stocks across different sectors can capture a significant portion of the available diversification benefit.
Key Takeaways
Systematic risk affects the entire market and cannot be diversified away, while unsystematic risk is company-specific and can be substantially reduced through diversification. This distinction underlies why investors are generally compensated for market risk but not for risks that could have been diversified away. This article is for informational purposes only and does not constitute investment advice.
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