[Badass City] how do you design price lists?

[JackTheOwner]

So, i can think only about one idea: You can arbitrary make some numbers. Like put 1 000 000 000 on biggest fancy house and items like jet plane. Think about also everyday items - if something has price 30, how long it will take for players to get such items?
And maybe Unique items can not be bought, only taken by force?