It looks like the shopkeep needs to restock his inventory before he opens up shop! That's part of Carp's production questline. Unlock the quest, and then go see Carp at the Marketplace! That is likely the prerequisite.
how do I know i unlocked the quest. I just need to fix the windmill water thing. That's all I gotta do. After that is when the quesg opens or no. Sorry for all my questions.
The production quests from Carp come in batches. It might be after that one! The quest journal will be implemented in v0.3.0, so hopefully that will smooth things over!
