Gaps and Slippage:
How Volatility Affects Execution?
Learn how volatility connects to price gaps and slippage, building on earlier lessons on trading costs and overnight exposure.
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This final lesson in the unit explores two related, practical effects of volatility: gaps and slippage. Both concepts have been introduced earlier in this Learning Hub, and this lesson brings them together specifically through the lens of volatility.
This lesson consolidates concepts from the Trading Essentials module's units on trading costs and trading styles.
Revisiting Price Gaps
As introduced in the Trading Essentials module's lesson on holding period and overnight exposure, a price gap occurs when the price at the opening of a session differs from the price at the close of the previous session, often because significant news occurred while the market was inaccessible. Gaps are, in essence, a visible manifestation of volatility that occurred outside of active, continuous trading.
Revisiting Slippage
As introduced in the Understanding Trading Costs unit, slippage refers to the difference between an expected and actual trade execution price, and it tends to occur more frequently during periods of high volatility or low liquidity. Slippage is, similarly, a direct practical consequence of volatility affecting trade execution in real time.
Why Gaps and Slippage Are Grouped Together Here
Both gaps and slippage share a common root cause: rapid price movement that outpaces the ability of the market (or a specific trade) to execute at a continuous, expected price. Gaps occur across periods when the market is closed or inaccessible, while slippage occurs during active trading, but both reflect volatility's practical effect on execution.
Bringing This Unit Together
Across this unit, we've covered what volatility means, how high- and low-volatility environments differ, how event-driven volatility arises, how volatility connects to position sizing, and now, how it manifests practically through gaps and slippage. Together, these lessons build a comprehensive, educational understanding of volatility as a concept that touches nearly every other area of this Learning Hub.
🔖 Summary
Gaps and slippage are both practical manifestations of volatility affecting trade execution — gaps occurring across periods when markets are closed, and slippage occurring during active trading during high-volatility or low-liquidity conditions. Together with the other lessons in this unit, understanding these effects completes a comprehensive educational picture of volatility and its wide-reaching relevance across trading.
Frequently Asked Questions
What is a price gap?
A price gap occurs when the price at a session's opening differs from the price at the previous session's close, often due to significant news during the inaccessible period.
What is slippage?
Slippage is the difference between an expected and actual trade execution price, more common during high volatility or low liquidity.
Why are gaps and slippage both discussed as volatility effects?
Both share a common root cause — rapid price movement outpacing continuous, expected execution — though gaps occur when markets are closed and slippage occurs during active trading.
Can gaps and slippage be completely avoided?
No, while awareness of high-volatility conditions can help with planning, gaps and slippage generally cannot be entirely eliminated, particularly during unpredictable, fast-moving markets.
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