> For the complete documentation index, see [llms.txt](https://ark-defai.gitbook.io/ark/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ark-defai.gitbook.io/ark/4.-layer-1-or-economic-laws-of-ark-defai/4.2-five-regulation-modules/4.2.3-yrf-module-or-yield-revenue-feedback/i.-module-positioning-and-functions.md).

# I. Module Positioning and Functions

| **Module Role**           | **Definition and Description**                                                                             |
| ------------------------- | ---------------------------------------------------------------------------------------------------------- |
| Functional Classification | Supply Regulator / Currency Buyback and Destruction Unit                                                   |
| Activation Basis          | Whether there is actual revenue, whether the buyback cycle has been reached                                |
| Buyback Direction         | Only performs steady-state destruction, does not participate in trading intervention                       |
| Compared to EM            | One side issues currency (supply), one side destroys currency (contraction), establishing a two-way rhythm |

YRF is one of the few modules in the protocol that "only operates when the system is healthy." It doesn't respond to violent market fluctuations or intervene to provide support, but instead continuously and transparently conducts deflationary buybacks.