Pricing attached opinionated value metrics to materials, goods or services based on perceived relative worth, desirability or necessity. It is usually easier to do this when there is an agreed upon currency scale that can be used across distance, culture and time. This system hinges on the currency in which it is valued in and the entity who enforces its use, and therefor subject to abuse, waste and increasingly negative consequences.
Specifically "and the entity who enforces its use"
OK, previously you agreed money was emergent. If I wasn't clear, let me clarify I meant, money existed in a stable form before governments began enforcing it, do you agree?
Also do you agree that the opinion of whether I want a $5 latte even when a cheaper alternative is available, it is still my right to expend my resources on an overpriced item if I so choose?