[quote=@BrokenPromise]
What's your definition of no culture? The closest examples I can think of would be a melting pot where there are so many cultures they all sort of blend together, or a society without traditions and standards of any kind. Maybe very early cavemen didn't have culture? I would think that any group of people are going to form their own beliefs about how things should be done and a culture is going to come out of that. 
[/quote]

>I would say something extremely cold, pragmatic, and scientific, but that's just another culture. The closest thing I can imagine is a hivemind or AI with a bunch of subminds that all think the same way, or act as limbs for the primary thinker, since it's rather hard to form independent thought and thus culture if you're just a singular entity. Another example I just thought of would be fungi or slime molds, which are just giant single-celled organisms that are capable of performing complex (for them) tasks such as moving towards food or merging with another mold, but sans an actual brain or culture of any kind. Though they hardly count as a civilization.

>Also, the answers are appreciated, especially the economy one. I so often focus on the cosmology of a world and the big picture that all the minutia becomes so overwhelming that I just ignore it. Which often means I end up making planets of hats and the like, even when I'm worldbuilding just for the hell of it.