Hadrian nodded along with Narivan's examples of relative value. It was an idea he had often considered, especially as the son of a merchant who would frequently talk about supply and demand, which was similar, though not the same thing at all. But when he made his price known, Hadrian was momentarily stumped. Something valuable on his person? He had some coin, but Narivan didn't want it. If this was but a copy, then the supply was greater than he imagined, but Narivan controlled the supply, so that didn't rightly matter.
He frowned, wondering if after all that he wouldn't get to take the book home. He sighed.
"I'm sorry, Master Narivan, but all I have on my person is a bit of coin and the clothes on my back. What I value is mostly in my head. That's where I keep what I've absorbed from books and classes and experience and life..."
There was a flicker of thought in his eyes. No, would he? He could take out his pen, borrow some parchment, and write out a simplified process for the blood-compass he had crafted for Hrair under Professor Stonemiller. It was precious to him in that it was a new level of complexity and skill at enchantment. It was precious to Hrair in that it might help him find his lost sister. But it might be useless to Narivan, unless he was a magecrafter-in-disguise. Stranger things were possible.
"I could... If you have paper, I could share the design and process for my thesis enchantment. With it, a competent magecrafter could copy it. There are some innovations involved. Perhaps not the sort that would help one survive the Valterrian, but..."
There did seem to be a sort of balance to the idea: his innovation for a book full of the innovations of others. But Narivan seemed to be able to read Hadrian while remaining for the most part obfuscated himself. It frustrated Hadrian, who wanted to know everything, but it was a frustration he had lived with his whole life.
He maintained eye contact with the other man, wondering if it would be enough or if he would scoff at what Hadrian held dear.