Buy pressure is the tendency for buying demand to support or push up an asset’s price relative to available selling supply. It is a market description rather than a single standardized statistic. In an order-book market, the key issue is how urgently buyers seek execution and how much sell liquidity is available near the current price.
How demand reaches the price
Aggressive buyers accept existing asks instead of waiting at lower bids. If they consume the available quantity at one ask and continue buying, trades may reach higher asks. For example, buying through offers at 10 and then 10.1 can lift the last traded price. New sell orders may absorb that demand, so buying does not always produce a sustained rise.
Reading evidence carefully
Traders examine executed trades, volume, price response and order-book depth for signs of buy pressure. A large displayed buy wall is only an outstanding order and may be changed or canceled.
Every matched transaction has equal quantities bought and sold. Buy pressure therefore does not mean that completed purchases somehow lack corresponding sales. It also does not reveal the buyers’ motives or guarantee that demand will continue.