Investor Corner/The asset classes/Equity Concepts

2.1.18 Systematic vs Unsystematic Risk

Systematic risk affects the whole market at once and cannot be diversified away. Unsystematic risk is specific to one company or sector, and holding a broader mix of investments genuinely reduces it.

~3 min read

Two different kinds of risk

Systematic risk comes from factors that affect nearly every investment at once: an interest rate change, a recession, a shift in inflation. No amount of diversification within equity removes it, since a genuine market-wide downturn drags down almost everything at the same time. Unsystematic risk comes from something specific to one company or one sector: a factory fire, a lost contract, a scandal at a single firm.

Why this distinction decides where diversification actually helps

Adding a second stock from the same sector reduces unsystematic risk, since the two companies' company-specific problems are unlikely to strike both at once. It does nothing for systematic risk, since a market-wide event still hits both. This is exactly why a portfolio of only stocks, however many of them, still carries meaningful systematic risk, while combining it with debt and gold reduces the portfolio's overall exposure to any single systematic shock.

Systematic risk Unsystematic risk 1 stock 30 70 20 stocks, same sector 30 25 Diversified across sectorsand asset classes 30 8
Illustrative effect of diversification. Adding more holdings reduces unsystematic risk sharply; systematic risk remains largely unchanged regardless of how many stocks are added.

What this means practically

Diversification within a single asset class genuinely helps, but it has a ceiling. Reducing systematic risk requires spreading across genuinely different asset classes, equity, debt, gold, rather than simply adding more names within the same one.

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