A moderately prosperous society is one where there is enough money and resources for people to live comfortable lives, but not enough to be considered wealthy. It means that everyone in the society is able to have enough food, clothes, education, health care and a safe place to live. It also means that people are able to have a good quality of life, with nice things like vacations, hobbies, and entertainment. It means that people have enough money to be able to save for their future and that they don't have to worry about sudden financial hardships.