Liquidity
How easily you can enter or exit a position without moving the price. High liquidity = tight spreads, deep order books, fast fills.
Liquidity describes how quickly and cheaply you can convert an asset to cash without materially affecting its price. It is arguably the most practically important concept for active traders.
A liquid market has high trading volume, tight bid-ask spreads, and a deep order book — meaning there are plenty of buyers and sellers at every price level. You can enter and exit large positions without slippage.
Illiquid assets are harder to exit in a hurry. You may have to accept a worse price (slippage) or wait days for a fill. In a crisis, liquidity can evaporate suddenly — even previously liquid assets become illiquid when everyone tries to sell at once.
Related Terms
Ask Price
The lowest price a seller is willing to accept right now. You buy at the ask.
BeginnerBid Price
The highest price a buyer is willing to pay for a security right now. You sell at the bid.
BeginnerExchange
An organized marketplace where buyers and sellers trade securities. NYSE and NASDAQ are the two largest US stock exchanges.
BeginnerMarket Impact
The adverse price movement caused by your own order consuming liquidity — buying pushes price up, selling pushes it down.
AdvancedMarket-on-Open / Market-on-Close (MOO/MOC)
Auction orders that execute at the official opening (MOO) or closing (MOC) price — guaranteeing the auction print but not a specific price.
IntermediateOn-the-Run vs Off-the-Run
On-the-run is the most recently auctioned, most liquid Treasury at each maturity; off-the-run are older issues that trade at a slightly higher yield.
AdvancedPenny Stock
Stocks trading below $5 per share, often in tiny companies. Highly speculative, illiquid, and prone to manipulation.
BeginnerSpread
The gap between the bid and ask price. A tighter spread means lower transaction costs and better liquidity.
BeginnerVolatility
The degree of price variation over time. High volatility means bigger swings — more opportunity and more risk.
IntermediateVolume
Total number of shares (or contracts) traded in a given period. Volume confirms price moves — no volume, no conviction.
Beginner