Liquidity
How quickly an asset can be converted to cash without losing value.
Cash is perfectly liquid. A brokerage account is highly liquid — sell shares, get cash in a couple of days. A house or a retirement account with early-withdrawal penalties is far less liquid — converting it to cash costs time, fees, or both. An emergency fund exists specifically because it's the liquid layer that keeps you from having to sell illiquid assets (or take on debt) when something breaks.
Worked Example
Two people can each have $50,000 in net worth, but one holds it in a savings account (liquid, spendable tomorrow) and the other in home equity (illiquid, would take months and closing costs to access) — very different financial flexibility despite the same number.
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