The players can sell steel, suplly and oil for coin in trade center and vice verse. The resources are trade by the ton and 1 ton = 1,000 resource. The order can not be cancelled, while you can change the price of your orders. There’s sales tax for the trade, the higher level trade center is, the lower sales tax becomes. From 0800 to 2400, the limited price for the order is from -20% to +20% of the average price of yesterday. From 0000 to 0800, the limited price for the order is from -10% to +10% of the average price of yesterday.
The market will list the 10 lowest price. So if you want to sell out your resources, the best way is to cutting down the price. In addition, the player can also buy resources from the NPC or exchange for coin.