In plain English
What Liquidity means
A liquid market can generally absorb orders without forcing prices far from the price available when the order arrived. Liquidity is often assessed through several indicators: bid-ask spreads, available size, order-book depth, trading activity, quote refresh, and the price impact of completed trades. In forex and CFDs, the liquidity visible on a platform may represent only the provider’s available pricing or connected venues.
Why it matters
Lower liquidity can make execution less predictable. Spreads may widen, orders may fill across several prices, and a position may be harder to close at a chosen level. Higher liquidity usually improves the ability to transact, but it does not eliminate price risk, counterparty risk, or the possibility that liquidity will deteriorate during market stress.
Example
Two markets each show a bid of 100.00 and ask of 100.01. In Market A, a 1,000-unit sell order fills near 100.00. In Market B, the same order consumes limited bids and averages 99.92. Although their displayed top prices matched, Market A was more liquid for that order size because its price impact was smaller.
Quick answers
Common questions
Is liquidity the same as market depth?+
No. Market depth is one indicator of resting buy and sell interest at price levels. Liquidity is broader: it concerns the practical ability to execute a given order with limited delay and price impact.
Why can liquidity fall during volatile markets?+
Market makers and other participants may reduce displayed size or widen prices when the risk of rapid price movement rises. Orders can also consume available quotes faster than they are replaced.
Sources