This led me to think about what would count as luxury and necessary items in a fictional world. For me, decent sanitation, flushing loos, good, clean water and so on are the basics of life and I can't imagine being without them. (And hope I never have to find out!). So what would be your luxuries? What would be basic necessities? Would your characters agree on what you come up with?
Can anyone aspire to the luxury market or is that restricted? If so, how is it controlled? Are necessities easily available or do people have to work particularly hard to get them? Can luxuries or necessities be taken away as punishment where the government of your world deems it appropriate?
Can a character in your world experience a rags to riches type story? And how do they adapt from a life of hardship to a life of wealth? (Just how long did it take Cinderella to adapt to her happy ever after ending?!).