Market abuse

[Yorok0]

Here is clear explanation of this feature/exploit (click the link to see whole topic with images). Probably too micro-intensive to use in actual game.

@redKnightks

Then whenever the trade carts reach any of your market, click them onto the nearby allied market and they will start trading with the farther market. Repeat when they reach the other market. This will effectively result in your trade carts being loaded both ways.