risks Article LIBOR Fallback and Quantitative Finance Marc Pierre Henrard 1,2 1 muRisQ Advisory, 8B-1210 Brussels, Belgium;
[email protected] 2 University College London, London WC1E 6BT, UK Received: 19 April 2019; Accepted: 5 August 2019; Published: 15 August 2019 Abstract: With the expected discontinuation of the LIBOR publication, a robust fallback for related financial instruments is paramount. In recent months, several consultations have taken place on the subject. The results of the first ISDA consultation have been published in November 2018 and a new one just finished at the time of writing. This note describes issues associated to the proposed approaches and potential alternative approaches in the framework and the context of quantitative finance. It evidences a clear lack of details and lack of measurability of the proposed approaches which would not be achievable in practice. It also describes the potential of asymmetrical information between market participants coming from the adjustment spread computation. In the opinion of this author, a fundamental revision of the fallback’s foundations is required. Keywords: LIBOR fallback; derivative pricing; multi-curve framework; collateral; pay-off measurability; value transfer; ISDA consultations 1. Introduction Since their creation in 1986, LIBOR benchmarks1 have grown in importance to the point of being called in finance newspapers the most important number in the world. This was the case up to July 2017, when Bailey(2017), the CEO of the U.K. Financial Conduct Authority (FCA), indicated in a speech that there is an increased expectation that some LIBOR benchmarks will be discontinued in a not too distant future.