> For the complete documentation index, see [llms.txt](https://cryptopolium.gitbook.io/whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cryptopolium.gitbook.io/whitepaper/marketplace/how-it-works.md).

# How it works

In the marketplace, the player can exchange trading posts with his opponent, but there are some conditions to be fulfilled beforehand.

* [ ] All trading posts must be sold.
* [ ] One of the player has to be visiting the Marketplace.
* [ ] The trading posts to be traded cannot be part of an already completed province.

{% hint style="warning" %}
IMPORTANT!

The player who swaps a lower-value post has to pay five times the difference.
{% endhint %}

<figure><img src="/files/9vOIhjaEE37KeeDlPH8y" alt=""><figcaption></figcaption></figure>