a game of yours? lol sounds like yer shopping for ideas..
LOL!
I do appropriate a lot of ideas, but it is in the more or less finalized stage at this point just needs me to get all the systems in my head down on it... It's a 400 page design document currently and the money system is only a long paragraph long but it is complete... (Has more words last count than the first harry potter novel if that tells you of the size and of the ludicrous amounts of typing I have done)
But anyhow, I decided that credits were kinda generic, so I created some coins based on some major stellar bodies *Since the game revolves around lunar colonists* and I kinda like the system.
If for some reason you wanted to use a similar system in this game...
On mars though with a frontier economy I would recommend they have a bit more practical coins maybe named after metals or refined elements, or colony parts, or terrain features unique to mars. Maybe... Dusts worth 1 credit.. Craters worth 10... Boulders worth 100 or 500.... Hills worth 1,000 or maybe 10,000 credits... and maybe something like Olympus Mons coins worth 100,000 since all the action will take place on mars... Or maybe something like Carbon Dioxides, Methanes, O2's, and Water coins.
Not saying the game needs that kinda a system, It was just kinda necessary for mine because of it's nature large financial transactions will be taking place next to small ones and I wanted to make both convenient and not confusing while giving players a sense of ownership for their virtual property. I don't see the need for development time to be used in this game for the same kind of system. Just pick something that every player will relate to as valuable in the colony maybe Watts or Milliliters of H2O or a Martian, or a Space Travel credit, and I am sure it would be a fine currency.