The order book is composed of two lists:
1. The first includes a list of buy offers and it is ordered according to the value, with the greatest value being on top.
2. The second list is composed of sell offers ordered with the one with the lowest value being on top. Each offer may have more than one order, in other words, if an offer represents more than one order the execution priority will be based on the creation date of the order, from the oldest one to the most recent one. Therefore, when the requirements requested are fulfilled the negotiation is completed.