> but implementing that plan correctly and consistently in a way that you can defend and audit can be very complicated. We established earlier that billing is

> but implementing that plan correctly and consistently in a way that you can defend and audit can be very complicated. We established earlier that billing is likely to be complicated, but that doesn't mean it isn't simple. Simple things can be complex. Simple refers to ability to understand, while complexity refers to scale of interconnected parts. They are not at odds with each other. > the answers are not simple, or at least I don’t think they are. I think you can make a strong case that business isn't simple, but billing systems only need to serve the needs of business after business has already figured things out. You cannot bill at all, even without a formal system, if you haven't answered these questions. A billing system merely needs to adopt the answers that are already understood.