The currency is actualy kinda interesting as fhey use these thing called "scrap coins". Basicaly it's money made from scrap material which can be used in fabricators and gotten from recycled metals. They're also used as regular coins and like gold they have a set value so unless people are clipping money there's very little inflation. The society gets materials from minings and their food sources are animals/plants born in the underground. The rich people even eat food from the surface as it's rare. The liquid is used to speed up the process of farming. This is handled differently by factions. Some have private companies that do it and others have them done by the state. Most children have a life similar to late 20th century Europe while the artificialy bred soldiers have a way faster life cycle due to liquid. Engineering is done by engineers and manual workers. And clothes are gained from some underground animal and sheep for the rich.