Lists all the contracts available. Product on the left side is the one you are exporting (selling) and the one on the right side is being imported. Contracts are meant to be used on a more permanent basis (when compared to quick trade). A contract has to be assigned to your cargo depot (not to a trading dock like in case of quick trade). In order to assign a contract, it has to be established first which has one-time Unity cost. Established contract also costs a smaller monthly Unity fee and you also pay a Unity fee for every cargo exchanged (depends on the amounts exchanged). To see the maximum amount of quantities that can be transferred in one ship journey, use the dropdown to select the size of a ship you are going to use. In case of more complex products, you can hover over the yellow 'diamond' icon to see their production value. Contracts are generally lucrative (especially when you're exporting complex products) but it highly depends on the efficiency of your factory - so they are generally recommended for advanced factories.
Shows the currently assigned contract. Product on the left side is the one you are exporting (selling) and the one on the right side is being imported. The displayed traded volumes are calculated based on all the cargo depot's modules that are assigned with corresponding products. If there isn't any corresponding cargo depot module for both the products then the estimates will show a question mark.
Efficiency is a ratio of produced power over used input. It represents how efficiently is input product converted to mechanical power. If the shaft is overloaded, some produced power will be wasted and efficiency will go down accordingly. There is also loss of efficiency when the machine is starting-up. To avoid startup losses, this machine should run continuously without interruption.
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