Explanation:
Structural models (such as the Merton model) view default as a function of the firm's capital structure and assume default occurs when the firm's asset value falls below its liabilities. Thus, default correlations in structural models are driven by the correlation between the asset values of different firms, which in turn are driven by common underlying economic factors.
On the other hand, reduced-form models do not explicitly model the firm's balance sheet or asset value. Instead, they treat default as a random, unpredictable event governed by an exogenous hazard rate (default intensity). Default correlations in reduced-form models are specified directly by correlating the hazard rates or using tools like copulas, without linking them to the asset values.
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Q.26 As part of a complex credit risk management strategy, a financial risk manager needs to explain the distinction between structural and reduced-form models in the context of default correlation models. Which of the following statements accurately describes a feature that differentiates these model types?
A
Structural models focus on the legal framework of default, whereas reduced-form models are based on underlying economic factors that impact a firm's assets.
B
Reduced-form models directly specify default correlation based on asset value, while structural models use statistical concepts like copulas to model dependency structures.
C
Structural models are based on underlying economic factors that impact a firm's assets, with default probability correlated through these factors, while reduced-form models directly specify default correlation without linking to the assets' value.
D
Reduced-form models determine default correlation through the common influences on a portfolio, such as market or sector trends, and structural models do not consider systemic factors.
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