At a high level, rarity scales with the # of players (and to a lesser extent the # of NPCs) in the game. Thus, if the game grows, rarity auto adjusts.
We set rarity on a scale of super rare to very common. If something goes over rarity, we stop automatically stocking it and it may not be available for requisitions and other semi-automated ways of requesting items.
We also have a concept of demand. At 1.0 you have normal demand, at 2.0 you have double the # of items available that its rarity would normally allow, at 3.0 it's triple, etc.
Rarity can also impact the price of an item. If there are more items than expected, the value of the item will go down, if there are fewer than expected, the value will go up. Supply and demand.
Here is an example of a small canvas, which due to rarity being 1.0 does not see a price adjustment:
generic small canvas aka small blank canvas
Count: 334 (max of 377)
Demand: 5.0 (1.0 is normal demand, 2.0 grants twice as many things)
Rarity: very common (1.0)
Base Value: 2,500c
Rarity Adjusted Worth: 2,500c
So, there are situations where we don't have an item configured correctly, and that may result in an artificial shortage of a common item. We added 'Demand' to rarity to address just this, but that is a newer addition and not every item that might have a problem has been updated.
It sounds like most of the issues people have raised have been around one of two things:
1. People hoarding items and thus leaving less for everyone else to fill basic needs
2. Common items that are too hard to find, possibly due to rarity restrictions.
Let's address some of that here.
HOARDING
We have automated reports on the admin side that notify us if people have a too big hoard, and we will reach out and tell them to get rid of some of their stuff. We also prune items from the market when there are more than 5 of them in the market, helping reduce bloat. When we have MOO Cleanup days we also audit a lot of items and identify if items have gathered in a specific area (such as the room where things go when you recycle chute them) or the HOJ evidence lockup, and clear it out.
In general, people should avoid hoarding a ton of a single item that they have no intention of using anytime soon.
COMMON ITEMS THAT ARE HARD TO FIND
This is a straightforward problem for us to solve! Usually, we address these when people bring them to our attention. Not every item is actually incorrectly setup, but we will review them when we are told something is too rare.
If there are common items that people feel like are falling into this category and need to be reviewed, please respond to this thread with the name of the item or the item class and I'll take a look.
CONCLUSION
If I've missed some of the concerns please respond here with them and I'll do my best to address them in a response. Hopefully this will help us solve for the most common ones!