Order Book Slippage

Order Book Slippage represents the difference between the expected price of a trade and the actual price at which the trade is executed, primarily caused by insufficient liquidity at the desired price point. In high-frequency trading and derivative markets, minimizing slippage is critical for maintaining profitable execution strategies.

When an order is large relative to the depth of the order book, the trade consumes available liquidity at increasingly worse prices, resulting in a higher average execution cost. This phenomenon is a direct consequence of market microstructure, where the technical architecture of the exchange limits the speed and efficiency of price discovery.

Traders often use limit orders rather than market orders to mitigate this risk, though this introduces the risk of non-execution.