In everyday trading language, liquidity has two meanings. One is how easily you can buy or sell without moving the price: a liquid market has many participants and tight spreads. The other, used in chart analysis, is about where orders are resting: stop losses and pending orders that sit around obvious prices.
Why orders cluster
Think about where traders place stops. Someone who is short will often put a stop just above a recent swing high. Someone who wants to buy a breakout may place a buy stop just above it. Because many people use the same obvious levels, orders stack up in the same places: above swing highs, beneath swing lows, above equal highs and below equal lows.
Why that matters
To fill a large order you need someone on the other side. Resting stop orders, once triggered, become market orders, which provide exactly that. Some traders believe larger participants are drawn to these areas for that reason. Whether or not that is true in a particular case, the practical point is that price often reacts around obvious highs and lows.
Buy-side and sell-side
- Buy-side liquidity rests above highs: stops of short sellers and buy stops of breakout traders.
- Sell-side liquidity rests beneath lows: stops of buyers and sell stops of breakout traders.