This is going to require some explanation to set up, as I have been working on this world for a while.
The world is an isolated alternate dimension (no stars in the sky) that contains a bizarre feature called 'The Rift.' The true nature of The Rift is unknown, but it is a 2km diameter feature that most people describe as some sort of opaque pit (it looks different to everyone). The only thing that is absolutely known about The Rift is that it expels things from itself that seem to come from a myriad of different universes. There is no set in stone rules as to what comes out of the Rift; organic, inorganic, magical, scientific, or mundane. However, there are some general guidelines for what it spits out.
It generally expels 'whole' objects, so you don't end up with only half of a cat, and it doesn't tend to produce things that are pre-damaged. While larger things come out sometimes, roughly cow-sized and smaller is much more common. Yes, it also expels people. Although not always the case, it tends to expel useful things (so random rocks are uncommon). Everything that comes out of The Rift lands on the 50m wide, desolate 'Rim' that surrounds The Rift, and is undamaged by landing. It is believed that everything in the world can trace its ultimate origins back to The Rift.
The rate at which things are expelled from The Rift is inconsistent, but high enough that several hundred people can make a living salvaging along The Rim. Despite the comparative rarity of life in the multiverse compared to inorganic materials, living things (including sentients) are still fairly common. The town of Edge is the treaty-enforced hub for all Rift-based trade, and is a Plutocracy (ruled by the wealthy). Edge maintains a small amount of food production, but is primarily focused on Rift-salvage. It has no real industry to speak of. There are systems in place to allow for magical translation (so language barriers aren't a big deal). Slavery is legal in Edge, though technically, entering slavery must be voluntary.
Rapid-growth flora (has to be driven back daily) has restricted the development of the world, but trade is still common, especially from Edge to the rest of the world. For now, I'm going to ignore the cultural Charlie Foxtrot that results from the population of the world originating from all across the multiverse (at all tech levels), that may come up in a later question.
The general tech level across the world is wildly inconsistent, but there are a few cities capable of industrial-level production on a roughly modern level, and at least one at a futuristic level.
So my question is this:
The Rift is a potential source of pretty much anything, but cannot be counted on to be predictable. With access to a random (and unpredictable) grab-bag of stuff from all across the multiverse, what would the economy of Edge look like? What sorts of things would they need to import to remain stable? Would having such unpredictable exports be a strength for their economy, or would the lack of consistency be a weakness? Would the Plutocracy need to build a backstock of valuables to trade, in case The Rift goes through a bit of a dry spell, or would the fluctuating value of their trade goods roughly balance out, as long as they were smart with their money?