Dynamic Initial Margin via Chebyshev Spectral Decomposition

Abstract

We present an accurate and computationally efficient method, based on Chebyshev Spectral Decomposition, to stochastically compute the Initial Margin of financial products within a Monte Carlo simulation, via sensitivities simulation. This methodology is compared in terms of accuracy, efficiency, and implementation/maintenance costs with common techniques used for the same purpose, such as amortisation-based, regression-based and Adjoint Algorithmic Differentiation. Measured in terms of these criteria, the methodologies based on Chebyshev interpolants offer an optimal solution and set a new benchmark standard for the industry.