raw prices are also rarely the final interesting signal; much more often, you're interested in some function of price, like the relative price [has it risen/fallen and by how much], or some product of price and volume.

ultimately the only people who deal with the same number as the price are people who trade unit amounts, and in most cases, the amounts anyone trades are determined more by their allocated capital [or by their needs for the goods] than by some momentary price.