# Cutting Edge introduction: viva cross-vegas

## Viva cross-vegas

Traditional models for pricing single-rate derivatives only look at their sensitivity to the implied volatility of the underlying rate – known as vega – in the same way that a single-stock equity option would typically be modelled. But fixed-income instruments are not like equities – no rate is an island, but instead exists within a term structure, subject to strict no-arbitrage requirements – and this means vega calculation is not quite as straightforward. In CMS: cov