A game update was recently released, and new mechanics related to foreign trade appeared in it. Clicking on the [Trade] tab opens the duties menu.
In-game tariffs can only be imposed on imports. And the export of any product can be banned altogether. When a duty is assigned, residents buy goods a little less, but not always. Lets say a resident can buy 20 units of wheat, he buys 10 on the domestic market. When a fee is assigned, this part does not change. As for the part that the resident imports, when a duty is imposed, the residents interest in it is reduced. The reduction in imports is equal to the assigned duty. Therefore, I limited the amount of duties to 10. (In this example, the resident will want to buy only 19 units of wheat, since 10 = imports, which are reduced by 10%) Thus, the imposition of duties will lead to more money remaining in the domestic market! In theory. You can assign all duties at once (Using the slider below). Or set up the duty separately (To do this, click on the duty amount). The gear icon means that the duty is configured separately. (Click!)

The export of goods can be banned altogether!