Limited Slippage

Limited Slippage
Most brokers guarantee fills on stop-loss and limit orders on up to a certain number of standard lots, and provide instantaneous trade executions from real-time quotes which are displayed on the screen. There is usually no discrepancy between the displayed price and the execution price during normal market conditions. However, you may be subjected to slippage when you trade during news or during periods of high volatility. In the futures and stock markets, execution price can be vague because all orders must be done through the exchange, and slippage and partial fills are common especially in the futures market due to the chaotic open-outcry system.