Where is the title of Spice and Wolf from? I bought volume one of Spice and Wolf today, and I read the summary on the back. I understand that the main female character is a wolf and the main male character is a merchant, but he doesn't just sell spices, right? Is the name just meant to sound badass, or was I wrong and he really only sells spices? I'm just not getting it.
This is cannot be explained without spoilers.


   The phrase "Spice and Wolf" was used by a merchant to describe the two main characters later on in this series. 


It was also repeated by the author in the afterward of volume 16 on page 299:


  ...But as the world of Spice and Wolf is not about viewing the world in itself, but the "Spice" and the "Wolf" (Holo and Lawrence) in it , it's actually the antithesis of that universal metaphor , so in other words... et cetera, et cetera, et cetera, ad nauseum.