Merchants and frustrations

[Shahed]

That is a difference in base resource value. It changes the amount you can earn from the trading site.

-The higher the base resource value the higher the trading income that site will generate.

Also As Musashi correctly pointed out (Thanks):

-The level of development of your capital influences the rate of return on trading investments.
-The type of capital influences the rate of return on trading investments with cities favoring the equation over castles.

The above 2 points are not relevant to what you are saying Aenlic, just wanted to think out loud, and get it clear for myself.

[Shahed]

BTW Iron in Zagreb is worth almost as much as gold if you are playing Turks.

[Musashi]

BTW Iron in Zagreb is worth almost as much as gold if you are playing Turks.

I think Iron is worth more when your capital is a Castle than when it's a City.