The Fanseeth use a representative currency. You may have a slip of paper, but what gives that slip of paper value is the fact that it is backed by something more concrete, and could be exchanged for some backing commodity at any time.
There are two different economic units of account that can be freely exchanged for fixed amounts of what they represent. Those two units are the Kilocalorie (kcal, usually stored in either a mechanical or chemical battery or in the form of glucose) and the Gram of Gold (gg, exchanged as coins or as bars for larger quantities).
Kilocalories are (usually) represented by a paper currency); gold is generally represented by coins of (usually) non-precious metals or other forms of physical token.
In day-to-day transactions, especially those involving a transient good—going out to a restaurant, by way of example, or finding fuel for a spacecraft—the kcal reigns supreme and is widely used as a base unit of currency. Most people with jobs are paid by their companies in kcal for their salary.
Grams of Gold are considered a long-term, more stable unit of value. Often when purchasing non-transient goods (e.g., a chair, a ship) the payment will be in in gg. If a job offers a retirement plan, it is often in gg.
At least, all of that is the theory. Government policies are implemented around this assumption, after all, so it has to be at least somewhat true. Right?
Economics and Culture
By and large, kappi and hakal work almost entirely in kcal currency and will do so even for more permanent goods. They often end up not owning their homes in a classical sense, since it is easier to rent when your income is in kcal.
Vordur are the opposite of this in a lot of ways, storing generational wealth in gg which they frequently pass down. Even when they don’t have a lot of gg, this is how they tend to measure their own wealth.
Bondi follow the intended pattern as closely as any group. They tend to have long-term wealth which gets converted into housing and used for retirement. Then hopefully there’s some left over to give to their children or to use to invest in their child’s education.
There’s a conversion rate between gg and kcal, but it fluctuates over time. We’ll have the exact exchange for the Fanseeth prequel event up in early January. In common practice, gg can always be exchanged for kcal, but the reverse is not always true.
It is theoretically true that you can reverse the transaction, but that requires a buyer and access to the exchange markets to make the sale. A lot of groups who are willing to do the currency conversion from kcal to gg similarly take a small cut as a handling fee for their difficulty in managing it on the monetary markets.
Representation in Game
For the most part we are going to be giving out kcal currency for this game in the form of paper scrip. You can also feel free to print your own if you think you’ll need or want more. But, if you want to bring gg into game: bring any non real-world metal coins that you want to use. Our standard will be the sort that you commonly see sold for, e.g., Stonemaier games and metal doubloons meant to represent pirate treasure, but any coin will do (be aware that if you acquire ones for ongoing games they probably aren’t going to be legal to spend in those games after trading them here).
But fundamentally that is more to throw around and make an impression. Every good or service sold by NPCs in the Fanseeth game in January will be available for kcal.