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The FAQ for specifies that inflation and cross-currency bases should be considered for Vega risk factors. These risk factors do not have an underlying residual maturity dimension. However, and do not specify the correlation parameter ρkl\rho_{kl} when one of the underlyings is an Inflation or Basis curve (and hence do not have an underlying maturity). In Atoti FRTB, when one of the underlying curves is an inflation or cross-currency basis curve, Atoti FRTB uses with ρkl(DELTA)\rho_{kl}^{(DELTA)} equal to 0% or 40% as determined by and .