Taking out the money currency exchange
Some have tried to apply one (or more) of exchange currency.
Arrow is the most common/knowdlagable item that people have tried to biuld the numeric
maths, turning it into some sort of coin or bill.
So an arrow weights relatively low and also, it is an item that is pretty common thoughout all the UnrealWorld.
Every culture, even the hostiles, uses them, craft them and they are everywhere, Like money, right?
Anyhow, beyond 14 arrows beeing roughly equal to "X roasted slices" or "X number of hare fur" for example.
Imagine you've want to trade three rough arrows for a fine arrow - OR a broadhead arrow for 4 plain arrows.
The thing is that if you want a bag of salt, which is an incredible source of power, you can try to exchange it for, let's say, 200 poor rough arrows. But who would consider rough arrows when the trader wants a bag of salt!
So instead the player can drop some more according items: "I'll give you this common spear from the north, add these leather skins and..." Well, you're getting QUITE closer to seal the deal. How can the player get that bag? Handing over 7 broad-head arrows.
Now, If the palyer offers 10 torches, some wooden little crafts and 40 roasted/smoked/salted... Well, try 80, 120 pieces of meat. Hmmm.. it gets awkward...
Anyhow. There have been many efforts in getting to know the value of the items in an "exact" number. So, knowing the "value" itself of each item the game has is something we all get better time to time. Your question is interesting.
Finally, I strongly believe we sometime have to lose. Overpay, or undersale, if that makes any sense in this language.
I get happy, with certain characters, when delivering lots of "gifts" (food, little mushrooms, certain items) just for the sake of common empathy. Not really thinking that if They like the gifts, they will sell cheaper, for example.
Sometimes you'll pay more. But the price is not fixed, it has not to be. How valuable could be a pinch of heather when you really need it? Okay, I don't want to do philosophy either. Like how much is a glass of water in the desert kind of stuff.
I still like the fact that no money, coins, or currency system is in-game. That's beyond any words.