Options Greeks measure how option price changes in response to various factors. Delta is price sensitivity to the stock move. Gamma measures Delta's rate of change. Vega is sensitivity to volatility. Theta is time decay.
Answer: The option price moves $0.50 for every $1 the stock moves. Delta approximates how much the option price changes per $1 move in the underlying stock.
Answer: Vega. Vega measures how much an option's price changes for every 1% change in implied volatility.
Answer: Time passing erodes option value against them. Buyers pay premium upfront — theta eats into that value each day as expiration approaches.
Answer: Delta changes rapidly as the stock price moves. High Gamma (usually near-expiry at-the-money options) means Delta is very sensitive to price moves — high risk/reward.
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