Plain English
Liquidity is the depth of the market — how much of an asset can be bought or sold quickly at the current price. A liquid market absorbs large orders cleanly; an illiquid market moves several percent on a small trade. Liquidity matters more than price.
How it actually works
On a CEX, liquidity is the depth of the order book at each price level. On a DEX, it is the size of the AMM pool. The deeper the book or pool, the less your trade moves the price. Liquidity also has a time dimension: it dries up during volatile events exactly when you most want it.
What it means for you
For any position you plan to exit (i.e., not “diamond hands forever”), liquidity is part of the trade. The unwritten rule for HNW positions: never be larger in an asset than you can exit in a single day without moving the market more than 5%. If you cannot, you are not in an investment, you are in an illiquid private placement — price it accordingly.
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Educational content only. Not investment, tax, or legal advice.