If your reputation is good enough, you can buy glass from the librarian and sell them as glass panes to the cartographer to gain free emeralds and experience, causing a trade loop. This trade loop can be accessed by getting hero of the village and/or curing villagers. I cured each villager once; the librarian sells 48 glass for 12 emeralds, which can be crafted into glass panes, which can be traded to the cartographer for 25 emeralds, gaining 13 emeralds.
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Yes, this only need to be balanced. This isn't an actual bug. But yes, fix this, because players would become overpowered for this.
And the problem is? Oh no, the global leaderboard of players with most emeralds will be flooded by people using this eXpLoIt!
This shouldn’t be fixed, like oh no, I spent hours getting hero of the village and curing villagers and getting lucky cheap trades, i’m soooooooooo OP.
Eh... I mean, there are things you can buy from one person and sell to another in real life. Having a couple trades where you can turn a slight trade by having the right villagers doesn't seem that bad, especially when you consider that the zombification exploit can do much, much worse. Right now I have a cartographer who will give me an emerald for 10 panes of glass, and a Librarian who will give me 4 glass for 1 emerald. If I exclusively trade with them I can create a loop, but it's a very mild loop... 3 emeralds gives me 12 glass, which I can turn into 48 panes, which I can sell for 4 emeralds and change, but my cartographer is selling me at ten instead of 11 because he likes me... how about if there were more of these, but with tighter margins? It would make it so you could trade and make a profit in emeralds but only at pretty low margins... you could set a goal for the best non-zombified margins being something like a 5-10% profit per trader in the loop... it might encourage people to have more of the unusual villagers around.
Of course, the zombification exploit is so OP... you could theoretically take two emeralds, buy 8 glass, turn that into 16 panes (and still have 2 glass for later) and if you'd zombified the cartographer enough you could sell at 1 per pane and make an 8 to 1 return, or set up a zombie farm and zombify a priest and get one emerald per rotten flesh.
When combined with the so-called "void trading" glitch (not sure if there's an open ticket for that yet), this escalates into a tantamout-to-dupe as you can go back and forth between the librarian and cartographer and in a single in-game day have essentially as many emeralds as you desire
Relates to MC-168451 and MC-153334