Once in a while a trader come by.
However the pricing of goods is weird.
How come is it that ore sometimes is higher priced than ingots? - Sorry smelters, but your work create negative value!
Same goes for rocks and stone.
And for pigs, meat and food.
(However this do not apply from ingot to armor or weapon, as they represent a fork in the production chain, so one of the two (but not both) can be less valuable than ingots.)
Prices for copper armor/weapon can be less than that of iron and/or mithril.
Prices vary a lot from trader to trader, one may sell rocks for 1 gold, the next may buy them for 4 gold...
As it is, then it seems market speculation is a great source of extra income!