Board Thread:Wiki/Forum Technical Support/@comment-25330335-20150329025639/@comment-27723099-20150329115016

Wheat is not just 1/3 bread but can be used to produce much more: 6 wheat = 16 ale (that can restore up to 40 hunger points in total), 2 wheat = 1 cow, cakes and cookies etc. But mithril should be more expensive. (Remember, the NPC prices can still change)

I agree with Ffets. Free economy means that there is nothing to bind the prices. Imagine you have a lot of food and meet someone in the desert who has no food and I'd starving, but has a lot of mithril. Then it would be reasonable for him to buy maybe bread for mithril nuggets 1:1. Unfortunately the mod allows it to ft out of every position, so there are never really urgent shortages.