Volatility Smile Inconsistency

Volatility smile inconsistency occurs when the implied volatility of options varies across different strike prices, defying the assumptions of basic pricing models. A flat volatility surface would imply that all options have the same implied volatility, but the market often prices deep out-of-the-money options with higher volatility to account for tail risk.

This creates a smile or skew shape on a graph of strike prices versus implied volatility. Recognizing and interpreting this inconsistency is crucial for traders to understand market expectations of future moves.

If a trader ignores the smile, they will misprice their options and fail to hedge their delta and gamma accurately.