I get the feeling from this and your previous post that you're associating something having value with it being traded or used as money? Value and currency. Am I wrong? I know that the majority of my possessions have very little monetary value (maybe even zero) but a lot of value none the less. Judging by the small understanding of the Imca I have, they placed a lot of value in a lot of non material things and also in material things that weren't readily tradable. A lot about the Inca isn't understood - their record keeping/message system for example, quipu. And these were made of string. A lot of their artifacts have been preserved in deserts and glaciers, allowing very fragile things to be recovered. Quite apart from first hand accounts, I would think that unless something major has been overlooked that is right in front of everyone, money didn't exist.