Please note that we've updated the Mount & Blade II: Bannerlord save file system which requires you to take certain steps in order for your save files to be compatible with e1.7.1 and any later updates. You can find the instructions here.
You have to get your trade skill maxed out. You can do this by grinding caravan missions. Talk to caravans to find a market deal. And then go execute the deal yourself. Mine actually bugged out and stopped progressing around level 120 or so. Something to do with save files I think? So I ended up using a cheat to finish my progression.
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