- CFA Exams
- CFA Level I Exam
- Study Session 14. Derivatives
- Reading 38. Valuation of Contingent Claims
- Subject 6. Option Greeks and Implied Volatility

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**CFA Practice Question**

The volatility surface is a three-dimensional plot of implied volatility with respect to both ______ and ______.

A. expiration time; exercise prices

B. expiration time; the risk-free interest rate

C. exercise prices; the risk-free interest rate

**Explanation:**The volatility surface is a three-dimensional plot where the x-axis is the time to maturity, the z-axis is the strike price, and the y-axis is the implied volatility. If the Black-Scholes model were completely correct, then the implied volatility surface across strike prices and time to maturity should be flat. In practice, this is not the case.

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