You cannot buy merchandise. There are several ways to get a small amount of merch, but not a huge amount all at once.Is there a shop in-game that sells merchandise? or Do I just have to beat up every red human icon I see on the map
The best way is passive income by setting NPCs as scavengers with amiable+ affection, 60+ survival, 60+ intelligence.
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Otherwise:
-Steal from the assembly plant
-Fight humans (loot)
-Investigate area -> Scavenge area
-Various once-off quests; the quest given by the Redhaven magistrate gives a whopping... 2merch/day passively.