> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Commodity curvature risk position

> The Commodity Curvature Risk Position (K_b) in FRTBCombinedCube, the bucket-level curvature capital charge under medium correlations per Basel MAR21.5, requires the Commodity Buckets hierarchy

<Badge color="gray" size="lg">[sbm](../tags/sbm)</Badge>

|                                      |                                                                                                                                           |
| ------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------- |
| **Description**                      | The bucket-level capital charge for commodity curvature also known as risk position, under the ‘Medium correlations’ scenario             |
| **Variations**                       | [incremental](./incremental), [high-low](./high-low), [euler](./euler), [netted](./netted), [reported](./reported)                        |
| **Hierarchies required in the view** | [Commodity Buckets](./commodity-buckets)                                                                                                  |
| **Reference**                        | [\[MAR21.5\]](https://www.bis.org/basel_framework/chapter/MAR/21.htm?inforce=20230101\&published=20200327#paragraph_MAR_21_20230101_21_5) |
| **Notation**                         | $K_b MediumCorr$                                                                                                                          |
| **Formula**                          | $\displaystyle K_b=max(K_b^{+},K_b^{-})$                                                                                                  |