Arbitrage

Individual names in top-down CDO pricing models

The Gaussian copula collapsed as a means of pricing collateralised debt obligations in the crisis of 2008, as to match prices and deltas nonsensical correlation parameters were required. By adapting the traditional framework to cater for more general…

Arbitrage under power

When one knows the correct value of a tradable asset and the asset price diverges from that value, future convergence may present a good trading opportunity. However, the trader still has to decide when and how aggressively to open the position, and when…

An arbitrage-free interpolation of volatilities

Nabil Kahalé describes a new construction of an implied volatilities surface from a discrete set of implied volatilities that is arbitrage-free and satisfies some smoothness conditions. His method provides an excellent fit to the smile of the local…

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