can you please explain to me the meaning of this strip?
Sorry, either "low numbers" or "living in the low numbers" is some slang expression (or a reference to one) I can't find. The Who (a band) used to be called the High Numbers, but I can't find a reference to what that means either. My guess would be "living in the low numbers" could mean living without a lot of money, i.e. just getting by, but that's just a guess.