Options Greeks: gamma: Answer Guide 2027
Gamma measures how fast an option's delta changes as the underlying price moves — it is the curvature of the option's value, highest for at-the-money options near expiration. In an options Greeks gamma interview question, define it, explain who wants gamma, and describe gamma scalping.
Gamma Interview Questions: What They Test
The intuition: delta tells you the hedge ratio today; gamma tells you how fast that hedge ratio will change tomorrow. High gamma means the position's directional exposure is unstable — market makers who are short gamma must constantly re-hedge, buying as prices rise and selling as they fall, which can amplify moves.
Interviewers want the long/short gamma framing. Long gamma (owning options) benefits from large moves in either direction — you re-hedge profitably by buying low and selling high. Short gamma (selling options) collects premium but bleeds on big moves and faces exploding hedge costs. The classic interview line: "long gamma wants movement, short gamma wants stillness."
How to Answer a Gamma Interview Question
- Define it. "Gamma is the rate of change of delta — how quickly the hedge ratio shifts as the underlying moves."
- Say where it peaks. "Highest for at-the-money options close to expiry — that is where delta changes fastest."
- Contrast long vs short. "Long gamma profits from realized volatility via re-hedging; short gamma earns premium but suffers on big moves."
- Mention the market impact. "Dealers short gamma must hedge dynamically, which can accelerate price moves — the feedback loop interviewers love."
Common Mistakes in Gamma Interview Answers
- Confusing gamma with delta. Delta is directional exposure; gamma is how fast that exposure changes — keep the order straight.
- Forgetting the expiry effect. Gamma explodes near expiration for at-the-money options — the "gamma ramp" into expiry.
- Ignoring the cost. Long gamma pays theta — the gamma-theta trade-off is the real economics of owning options.
Gamma is the most dynamic Greek — the long/short framing plus the dealer feedback loop is the complete interview answer.
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FAQ
Q: What is gamma in options trading? A: The second-order Greek measuring how much delta changes for a one-point move in the underlying — the curvature of the option price.
Q: When is gamma highest? A: For at-the-money options approaching expiration, where small underlying moves swing delta dramatically.
Q: What does it mean to be long gamma? A: Owning options — the position benefits from large price moves since dynamic re-hedging locks in profits from volatility.
Q: Why does short gamma amplify market moves? A: Short-gamma dealers must buy rallies and sell selloffs to stay hedged, adding pro-cyclical flow that accelerates the move.
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