Persistent money/economy would need a LOT to think about how it would work, there are many issues there that would need to be solved, one being antags.
Say an antag steals money from another crewmember, or a departmental account, that obviously isn't canon and shouldn't be Persistent. Security charges for antags are automatically deleted so something may be able to be done there, but a different issue is if the antag blackmails another crewmember (a non antag) to do it. This crewmember doesn't have any kind of automatic thing to delete antagonistic actions like an actual antag would, and in terms of a security charge, would need to manually delete it. How would something like this work for Persistent money...