Liquidity
Educational only, not financial advice.
Liquidity describes how easily an investment can be bought or sold without significantly moving its price. Highly liquid assets can be traded quickly and cheaply; illiquid assets can be slow or costly to trade.
Why it matters
- Highly liquid ETFs and stocks tend to have narrower bid-ask spreads and lower trading costs.
- Illiquid investments can be difficult to sell quickly, especially during market stress.
- An ETF's underlying holdings' liquidity matters more than the ETF's own trading volume, since new shares can be created or redeemed.
Simple example
- A large-cap S&P 500 ETF is typically highly liquid, with tight spreads and heavy daily trading volume.
- A real estate property or a thinly traded micro-cap stock is comparatively illiquid — it can take time to sell at a fair price.
How beginners use this
Prefer liquid ETFs for core holdings so you can rebalance without painful spreads. See bid-ask spread.
Related terms
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Sources
Reviewed by Greg Parsons. Links checked October 14, 2026. Educational only, not financial advice.