Time-Varying Asset Volatility and the Credit Spread Puzzle
54 Pages Posted: 14 Oct 2011
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Time-Varying Asset Volatility and the Credit Spread Puzzle
Time-Varying Asset Volatility and the Credit Spread Puzzle
Date Written: October, 13 2011
Abstract
Structural credit risk models have faced difficulties in matching observed market credit spreads while simultaneously matching default rates, recoveries, leverage and risk premia - a shortcoming that has become known as the credit spread puzzle. We ask whether stochastic asset volatility, as an extension to this model class, has the ability to help resolve this puzzle. We identify that although there are three ways in which uncertainty about asset risk can influence spreads (asset risk volatility itself, dependence between the levels of risk and asset value and finally volatility risk premia), in a calibration setting only the volatility risk premium channel is economically significant. We show that this feature of a stochastic asset risk model allows it to match historical spreads and equity volatility as well. We also provide estimates of the required variance risk premia.
Keywords: Variance risk premia, default swaps, structural credit models
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