It seems appropriate to mention The Quantum Thief by Hannu Rajaniemi, a whirlwind sf novel where a large part of the story involves a city where the currency li

It seems appropriate to mention The Quantum Thief by Hannu Rajaniemi, a whirlwind sf novel where a large part of the story involves a city where the currency literally is Time. (When a person runs out of Time, they are transformed into a Quiet, mutely doing the necessary work to keep the city running, until they have earned enough Time to be restored to themselves.)