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You make Achaea's system sound very unappealing / unfun somehow, Mboagn.  I'm really not sure that we should be fighting over basic comms.

I think we need to move away from the mob-conversion model of commodity generation (Kill/bring critter to mob to get comms). It doesn't scale well with population. For example, 10 rockeaters can hour can comfortably support maybe 10 players. But what happens if we grow our population to 20? Would we need to expand the rockeater population every time the player population fluctuates? Do some players just have to live without rockeater products? This is bad because it's inflexible; even worse, it hits new players harder.

Instead, I will echo the idea for Aetolia's farming or Achaea's mining systems. Essentially, players can work on a plot of land and have it produce commodities. Producing commodities costs gold (depends on the commodity in question). This is more flexible. If, for example, there is a lot of gems floating around the market, then ideally the price for gems would drop and it would become unprofitable to continue mining gems. People will then move to mining other things until gems become desirable enough that their price rises and it becomes profitable again.

It all sounds very capitalism, but it can work particularly because it'll be easier to 'switch business focus' in a game rather than in the real world where some poor employee will have to bear the brunt of a shifting market.

As to what form these plots of land will take, there's a couple of options.

Aetolia's is actual plots of farmland which you...farm. Each player can get their very own farmland.

Achaea's is more competitive (but also harsher to new entrants). Lodes pop up all over the continent every now and then. Miners rush to send their workers in to mine it. Only one player can work a mine, and players can attack each other's mines.

The way Achaea handles stockpiling is that there is an absolute limit to how much a player rift can contain. Otherwise, you need to buy extra storage space in a facility. It costs something like 1 gold per RL day per 1000 units of a commodity, rising exponentially? So you can stockpile, if you want, but it'll cost you a bit.

The biggest commodity drains on Achaea are player houses (costs commodities to expand/improve) and city improvements (sort of like our constructs and researches). There are some deadweight commodities (like iron, which has never been profitable to mine but is excellent for new miner training*) and some really valuable commodities (silver, the one that people will fight over).

Overall, I think this kind of system works because it is flexible. You can opt not to mine something if it's not profitable. You can opt to stockpile a commodity and try and manipulate prices. You can be charitable and sell for below your mining cost.

It also has the benefit of being a huge gold sink (mining itself will delete gold in the form of the worker wages, plus the cost of storing comms).

* Players hire NPC worker groups to mine stuff. The NPCs earn 'experience' as they mine so they can mine faster/fight off invaders better

I agree with a lot of the things said here, especially about making it so the ability to produce different commodities is more consistent, and doesn't require conflict-type activities. I'd also like to observe that, when balancing the commodity production levels, Lusternia always seems to forget that making commodity stock levels right for trades like Jewelry, Cooking, and Tailoring makes them impossibly hard for Artisan which uses 10x as much and is especially heavy on some of the harder-to-produce commodities. While some commodity levels for artisan crafts could stand to be adjusted (30 commodities to make a box with a capacity of 4 that only lasts a few years, compared to what 30 will get you in most trades?), many of them are fine to cost as much as they do, since they will last a long time (and often forever due to stasis gems). But if you balance an economy around a certain level of scarcity while thinking of things that take 20+ comms for an item, you end up making a trade that takes 200+ comms impossible to ply.

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Saran said:

An idea I've been toying with recently, mostly in line with the idea of the mercantile skills, is giving guilds some unique crafts.
Not an entire unique trade but more like, maybe moonwater is only available to the Wodewoses. Possibly going even further and having guild unique crafts require a guild workbench (in the wodes moonwater case you'd make it an rp thing about the alembic is actually blessed by the forest spirits or something which is why it's needed, handwave why we could do it before heh)

While moonwater and the equivalents are an example that's unique for each org, it seems like you could be pretty fine doing something like... If wetfold/kirigami moved out of bookbinding, maybe one one guild in each org can actually craft each and its skinned appropriately. Like maybe Listener kirigami is a token of the ancestors that you release to receive their blessings, but revelry maybe make a really awesome shot you down for the exact same effect just skinned differently. 
All orgs would have access to the same stuff in the end, and each guild should be pretty much equivalent, it's just an avenue to increase the relevance of guilds and promote their identity.

Please no, that will only make the issue of some guilds not having high populations even more apparent.

Also, just a modern struggle I'd like to point out - my number one reason for neglecting my shops these days is pricing. I have no idea what to price anything anymore. The majority of my commodities have come from me farming them up myself and using crucibles as applicable, and I don't really buy much off of the market. This leaves me seriously disconnected to the general cost of things, especially as they also vary org to org so even Seren's pricing isn't necessarily a perfect reflection of what is "reasonable" or "fair". Seriously, pricing in the modern age is the worst and it'd be nice if there was just like, a board at Trader Bob's that floated the average price of commodities across all organisation comm shops or something. That seems like something Bob would care about and keep tabs on.