Exchange

The Exchange, accessed through the appropriately marked button in the upper right, represents the open market. There you can buy and sell the resources in your possession. The interface makes it easy to dump all civilian goods (i.e. anything not generated by industry for the purpose of weapons manufacture) at the click of a button. You can also reserve certain goods and prevent them from being sold.

Strategies

 * In general, selling weapons on the open market is not nearly as beneficial as selling them to war participants. Always focus on what matters: The profit.
 * Be sure to sell civilian goods regularly, unless you want to save up on headquarters upgrades.