I think you'll find that few, if any, "economic predicates" are universally agreed upon. Certainly, in your original post, you're accepting some premises that allow for your own claims to be true, and which are not universally agreed upon. So why can't he?
I think you'll find that most, if not all, human conversations are embedded in a context, which carries assumptions, so that participants can understand each other without iterating all of their definitions. That's why, for example, I don't have to start every conversation in my life by clarifying that I will not be explaining everything in terms of Xenu and thetans.
And if I did want to explain things in those terms, I should first explain why that's a valuable frame to adopt.
