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No question that gold in circulation right now is pretty insane, which is driving credit prices up, and wrecking all sorts of havoc. Let's talk.
My first idea:
Sell non-decay for gold. Really no huge in game impact, makes sense, and wouldn't hit IRE's revenue stream too hard.
Get rid of remedies, harvesting, and alchemy.
Reason: Everyone uses elixirs/plants/minerals. This wouldn't have a HUGE impact, the initial impact of it would hurt with refunding the skills but in all honesty, they aren't super expensive to trans out as it is, so it wouldn't be a massive impact. This would have a huge effect on the world gold and would cause everyone to have to purchase plants from npc's. Allow shops to still carry plants, tuns (elixirs/alchemy), and minerals bought from the npc's that way if they ever do bought out, monopolies wouldn't boom up. Or make the npc carry unlimited amounts of them and still allow it, that way it causes people to buy from their city shops still but it is still something that makes the gold slowly fade from player hands. This would effectively remove a couple arties from the market, but most of those artifacts are the arties that people either buy for the long haul or last just because why not.
Toxicology can remain due to it not being universally needed for everyone in the game, and the classes that do use venoms are usually the most expensive to artie out. Minus DW.
Feel free to dispute/discuss my ideas and suggest your own!