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Risk and diversification explained

Build room for the unexpected.

Diversification spreads exposure across investments. It can reduce concentration risk but cannot eliminate losses across a falling market.

intermediate · 7 min · Draft prepared with AI assistance · Human review pending

Risk has more than one shape

Price volatility is visible, but inflation, liquidity, credit and concentration risk matter too. Money needed soon has different requirements from money intended for a distant goal. A portfolio should be considered alongside debts and cash needs.

Correlations can change

Two assets that usually move differently can fall together during a crisis. Historical correlations summarize a particular sample; they are not permanent laws. Avoid building a plan that depends on one relationship remaining stable.

Rebalancing is a process

Rebalancing brings a portfolio toward a chosen allocation. It can involve costs and tax consequences, so the frequency and method need thought. A documented rule can make decisions more consistent, but it does not guarantee a better return.

Try the idea

One asset loses up to 30%, while everything else stays flat. The line shows a hypothetical stress path, not historical portfolio returns.

Step 10Example value: $85
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A MOMENT TO REFLECT

What can diversification reasonably do?

Next lesson: How to read market cues

Further reading: Primary source
Educational draft · Updated 6 October 2026 · Report a correction