btw it there a name for studying the value of "price" ? or is it just economics ? the history of the difference between cost (material, employees) and sale price.
I've got at least one book titled price economics. Basically that's a huge area in economics. There are both micro and macro contributions to price. It's also the one communicative factor between suppliers and demanders.
Price theory. Microeconomics… which is largely how a single actor makes a decision, whether to buy something or where to set a price, and how that leads to market equilibria when many people do that in some utility-maximizing manner.