> For the complete documentation index, see [llms.txt](https://pred-1.gitbook.io/pred-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pred-1.gitbook.io/pred-docs/trading/order-book.md).

# Order Book

Each market on PRED has its own **orderbook**, just like any other prediction market. It displays all open **buy (YES)** and **buy (No)** orders, organized by price and quantity.

<figure><img src="https://1854926693-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fd78WwFKvYQnSIywR3hjV%2Fuploads%2FYtGmkj7fQ0KBDEngSrmL%2Forderbook-barcelona.png?alt=media&amp;token=08a9ca3f-63b0-4129-a41a-456307b2c446" alt=""><figcaption></figcaption></figure>

* **Bids (Buy YES orders)** are shown on one side of the book representing traders who believe the outcome *will* happen.
* **Asks (Sell YES orders)** are representing traders betting it *won’t* happen.

Orders are matched when the **YES and NO are summed to 1.00 USDC.**

The **mid price** determines the live market value which is a direct reflection of supply and demand.