

After all "fair" is what both sides agree upon - "correct" on the other side is what you're trying to archive but model needs some tweaking. So I'd say leave it as a reference but don't position it as "true fair" because its not true. So what I'm trying to say is while you did a good job clarifying goods ratios regarding to space and population, your model still lacks a lot of game aspects and mechanics. What exactly "trade partners" mean? Only among the guildmates trades are free (fair) and how many members can a guild have? Only 80 and consider not all of them are in the same age, have every deposit needed or even traders in the first place, there are fighters too and also a diamond farms. I did not research into total amount of particular goods through all those activities but it would be natural to assume that devs distributed them about equally. And neither of those activities will ask you about "cheap" or "expensive" goods. They need them for 3 reasons: progressing through tech tree, building new GBs, GE and GvG stuff. I think you're not fully understand why people in this game need goods for.
