Liquidity
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Liquidity describes how easily you can buy or sell without moving the price. Deep liquidity means tight spreads, reliable fills and orderly movement. Thin liquidity means wider spreads, slippage and sudden jumps. Liquidity varies through the day, peaking when London and New York overlap and thinning during the late Asian session, holidays and the minutes around major releases.
Full explanation
Liquidity comes from the volume of resting orders on both sides of the market. Currency majors are the most liquid instruments in the world, but even they thin out around rollover, public holidays and immediately before scheduled news, when market makers widen quotes to protect themselves. Practical responses are to trade the liquid overlap hours, avoid market orders in thin conditions, and expect wider spreads for a few minutes after high-impact data.
Why traders watch it
Poor liquidity turns a good idea into a bad fill. Most avoidable execution costs — slippage, spread spikes, stop hunts — happen in thin conditions.
Related indicators
Asian session
The overnight session driven by Tokyo, Sydney, Hong Kong and Singapore, typically quieter and range-bound.
Clear direction
When one side is plainly in control: price makes progress one way and pullbacks are shallow.
Consolidation
A pause in which price moves tightly sideways, often after a strong move, while the market absorbs it.
First spike
The sharp, immediate move in the seconds after a release or a level breaks — usually the least reliable part of the whole move.
High-impact news
A scheduled release with a strong record of moving markets sharply — for example inflation, employment data or an interest-rate decision.
Holding a move
When price stays at its new level after a move instead of drifting back — the sign that the move was accepted.