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Abstract
The authors present a straightforward extension valid in the current negative-rate regime of the “universal relationship” uncovered in De Guillaume, Rebonato, and Pogudin (2013) between the level of rates and their volatility. They also provide an explanation of the origin of this relationship by showing the existence of two sharply distinct regimes for the volatility of real rates as a function of real rate levels, and by linking periods of high inflation with periods of high real rates. Finally, they provide evidence that the “volatility of volatility” also displays a “universal” behavior, with a significant linear dependence on the level of rates (and of the volatility itself).
TOPICS: Fixed income and structured finance, statistical methods, volatility measures, developed markets
Key Findings
▪ The universal relationship, across currencies and tenors, between volatilities and the level of rates first presented in De Guillaume, Rebonato, and Pogudin (2013) also applies to the extremely low-rate environment of the last decade, and this article presents a simple extension of the relationship to handle the case of negative rates.
▪ The authors explain the origin of this relationship by showing the existence of two sharply distinct regimes for the volatility of real rates as a function of real rate levels, and by linking periods of high inflation with periods of high real rates.
▪ They show that the “volatility of volatility” also displays a “universal” behavior, with a significant linear dependence on the level of rates (and of the volatility itself).
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