> For the complete documentation index, see [llms.txt](https://peakfinance-dao.gitbook.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://peakfinance-dao.gitbook.io/documentation/peak-finance-docs-v2/the-basic-economic-model/understanding-usdpro-as-a-share-token..md).

# Understanding $PRO as a share token.

As a share token, the economic rationale of $PRO is covered in depth in the [Prometheus V1 Whitepaper](https://peakfinance.io/whitepaper/). In the following sections, we will take a closer look at the unique ways the $PRO token is supported.

On first principles, $PRO's primary function is to qualify participants to earn $PEAK emissions during inflationary epochs. 

Like $PEAK -- $PRO largely derives its value from the pro-rata quantity of $METIS in the liquidity pool. 

A common behaviour within the confines of game theory is that recipients of $PEAK will effectively shift $METIS from the $PEAK liquidity pool into the $PRO liquidity pool to pursue a greater share of $PEAK emissions in future epochs.

However, $PRO is much more than just a share token to participate in the Peak Finance Ecosystem, which we be explored in the following sections.