Why prices are so useful is they signal and signify value, or the value people have in them.
For example, the reason why the price for Bitcoin is so high — people value it greatly?
Or the reason why people pay high rents in desirable locations and places — because it is desirable!
Price as a filter
Also price is also often a great filter; it simplifies life — typically things on sale make easier purchasing decisions, and makes us feel more satisfied with our decision making process.
Also a simple calculus — often things which are more expensive are better.
Prices as pure information?
A life without prices would be a terrible life — the tyranny of day to day living … and impossible societal living!
Prices don’t lie.
A life without prices is tyranny?
Revealed preferences: what people actually spend their own money on reveals what they truly value!
Prices as solidified values?