At its core, the Grand Exchange is a very simple system, and you can buy or sell items using the following steps:
1. Bring items you wish to sell or money to buy items.
2. Speak to the Banker or mayor to either put items up for sale or to make a bid to buy items.
3. The banker or the mayor will take your items or money and look for a matching bid/sale to match you up with.
4. You may have to wait for your bid to be accepted or for the banker or mayor
to find a buyer - then again, it could happen in moments!
5. You will receive a message when the trade has been completed, and you can go to the Banker or the mayor to pick up your purchases or money.
Because the Grand Exchange never closes, the Banker or the Mayor will try to find you a buyer or seller constantly - you don't need to be logged in or on the same world as the player they match you up with. You don't even have to be at the Grand Exchange or in a bank: you can go off and work on your skills, play through a quest or anything else you enjoy doing, and just wait for the message from the Grand Exchange!
Edited by Leanys, 03 February 2011 - 02:17 PM.