At this point, I would like to share some of the insight that we hope to achieve in the future.
At this moment, every port sells up to two resources (1 basic + gold bars) and buys up to 7 (6 basic + gold bars).
Ports have long stopped producing resources. The only reason that there are still more than enough resources for everyone to trade, is because of the huge stocks that have been created (and are still maintained) by the voodoo curse (that is no longer generated but still available) known as Fertile Lands (you can find it in the encyclopedia if you do not have it).
In the future, we foresee some great natural disasters that will wreck these stocks (perhaps you should think twice before spending this very important and ultra rare card). These natural disasters will NOT come before all resources can be produced by players. Right now, only Gold Bars are produced by players and soon, food.
The production of all resources by players will signal the end of the market as we know it. All ports will produce everything (at bigger or smaller quantities) and as a result they should be able to sell everything. In the same time, they should be able to buy everything. At this moment, the market system already records all sales on every port. This means that every port, already has a stock of resources, based on which the prices are defined. The only thing that will in fact change, is that players will get to access this market at its full.
The road till we can achieve this, is going to be long and I am in no position to make estimates on when this will happen. I only know that we have 7 more resources that need a way to be produced. Therefore, I am just giving you a long term insight here. This piece of information is not valuable in terms of strategy yet. But it still worths sharing.