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The Incremental measures evaluate the impact of a trade or a group of trades (‘current scope’) on the grand total result, by comparing it with a computation as if the given trade or aggregate of trades were hypothetically removed. Mincremental(scope)=M(portfolio)−M(portfolio excl scope)M^{incremental}(\text{scope})=M(\text{portfolio}) - M(\text{portfolio excl scope})

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Example

In the following example, the VaR Incremental Booking measure shows the impact of the three sub-portfolios on the firm-level VaR number.
Incremental IMCC example
  • The left pivot table shows that the VaR Incremental Booking for the business line “Equities” is +15.414, which means, that this portfolio has a positive +15.414 impact on the firm-level VaR
  • To validate the incremental measure for the business line “Equities”, let’s compute firm-level VaR with a filter excluding this node (on the right pivot table), then the VaR is -609k which is 15.414 lower (-593k - (-609k))

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See also