How does Steam Market work, exactly, cause sure as hell not like Stock Exchange

Regional currency difference? Especially on lower priced items.

right click & "view page source". that's how it works. :P
sorry, no idea why that happened to ya xD

So let's say a currency's exchange rate is twice as much as another currency. For the sake of simple explanation, let's go with CAD vs USD (these don't have a 2x difference, but this is just an example). Let's pretend that $2 USD equals $1 CAD.

Now there is an item on the market which costs $0.01 (I removed the Valve and developers fee). A Canadian user lists a market item for $0.01 and a USA resident lists the same item for $0.01 - both have the same price in their currency, but the Canadian listing is actually more expensive in global currencies. Since there is no lower possible amount of money than $0.01, Steam can't "optimize" the chart properly. When a Canadian buys the $0.01 listing, in USD it shows up as $0.02 when it's actually not exactly correct.

Not sure if that makes sense, it's a bit complicated to try to explain what I'm thinking, but that's the gist of it. Of course, this is entirely a logical assumption, and I have no proof that this is the case whatsoever - if anyone cares to confirm or deny my theory, feel free. I've been curious about this as well.

The graph are not always accurate, because it deals in USD, but several currencies allow you to fine-tune the price more, so roundings can cause strange issues.
As for how it works, it is the lowest-priced cards that get sold first, and the oldest one should have priority. Even if someone posts a buy offer with a much higher target price, they get those cards. So if you posted the sell offer for 4 cents and there are already 4000 cards at that price point, you need to wait until all of those are sold or revoked first.

Spooky sounds Bot price fixing wooohowhowooowooooooooo!!!!

Silently walks back to the creepy basement with tin foil hat