When King Zar got a letter in December from King Michael stating
"King Zar. I send you this letter in hopes to do business with you.
New Citizens have made it possible for Gaster Kingdom to obtain 900kg of fish on a daily average, sometimes breaking over 1000 and as low as 650 at their worst day.
I have more than enough to keep my Kingdom well fed, but i'm looking for profit from this project, therefore I'm offering to sell you a kilogram of any fish, for a Gold Coin.
I wish to hear from you soon,
King Michael of Gaster Kingdom."
With the official stamp of Gaster Kingdom at the end of the letter which included a Fish on a white flag.
You would expect something ore based but Gaster Kingdom was founded primarily because of the plentiful fishing area. The mines were discovered later.
King Zar could not help but notice this situation becoming profitable for both Kingdoms.