What structural credit risk model uses estimations of volatility and total value of the firm's equity?

• A. Merton model
• B. KMV model
• C. Black-Derman-Toy model
• D. Ho and Lee model

Answer: (B)

The correct choice is the KMV model, which is a structural credit risk model that estimates the probability of default based on the value and volatility of a firm's equity. Developed from the Merton model, the KMV model uses Merton's framework but enhances it by incorporating actual market data to derive more accurate estimates of default probabilities.

In this model, the total value of the firm's equity is treated similarly to an option; if the value of the firm's assets falls below a certain threshold (the default point), a default occurs. The model calculates equity volatility and the firm's asset value through the information available in the stock market, allowing it to incorporate real-time market conditions into its risk assessments.

The KMV model also includes considerations for the capital structure of the firm, which further refines its ability to predict credit risk. By focusing on these market-based inputs, the model can provide a more dynamic assessment of credit risk compared to static models.

This holistic view of a firm's financial health makes the KMV model a popular choice among practitioners assessing credit risk, as it links the risk of default to equity market behavior and underlying firm value.