Elder Scrolls IV: Oblivion

[kandrathe]

Vendors in Morrowind had a limited amount of gold. Once it was gone, it was gone for 24 hours, so unless you knew about the Mudcrab merchant, you were SOL for mass-selling unless you knew of a good spot in one of the major cities. ...
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Ah, yes. But there was a bug too where if you had 100 arrows you could sell them to some vendors for 1g ea (min price), then the vendor would have 100 arrows. You buy the arrows back at a hugely reduced price, then sell them again 1 at a time back to the vendor. Now the vendor has 200 arrows, etc, etc, etc. The vendor eventually has a huge number of arrows and they continue to restock to the new level. Voila! Super arrow vendor, and you traded back and for enough to sap all the vendor's gold and leave them super stocked. Same thing worked with Alchemy ingredients.