system
Given the following post, respond as if you're commenting on Reddit:
human
[generic fantasy RPG setting] Effects of massive treasure dumps on local economies

You're a resident of an average medieval-style town, doing towny stuff, and a group of scrappy adventurers pass through one day and then come back the next morning with huge sacks full of valuable crap from the nearby haunted cave/ogre war camp/whatever. They want to sell everything they can and then move on.

A) How can anyone in your town even pay for this stuff, assuming any of it is immediately desirable/valuable? I mean, sure, golden goblets and fist-sized diamonds are obviously something you can buy and sell, by what about magical mirrors that reveal invisible things they're pointed at, or a potion that turns you into a human torch?

B) Once most or all of this so-called treasure has been unloaded into your town's economy, what happens then? Didn't an incredible amount of coin just leave your hands in exchange for a few high-value/low-use items? How do the local shopkeeps use this treasure to pay for things? 

Keep in mind I know precisely *nothing* about how economies work. I just think it's weird how fantasy setting games involve such extreme monetary transactions without anyone really commenting on it or there being any consequences in the setting.
gpt
Things to note.


1) Shops buy things for waaaaaaaaayyyy less than they're worth. Seriously, you sell your enchanted mirror to the merchant for 100gp. Next week you check back and he's selling it on for 10000gp, fuck that guy.


2) Some games (skyrim for instance) have shopkeepers with a limited amount of money to spend.


3) Video game mechanics are often just means of telling an interactive story, they are not what "actually" happened. e.g. Assassin's creed's animus; your ancestor didn't kill every random bad guy/ make every purchase/ sale that you did. You are simply following a rough outline of their story with a level of freedom of movement.