Ahhh. Good to see it got up here eventually.
As I've stated in the other thread, I'm not happy with the economy and it should change.
I think that all coins should be minted out of any metal and be backed by actual materials (as real world money is, technically) and so you could say that your money is worth anything you liked, but at first people would want the actual materials, to check that you have them.
As your fort trades and progresses fewer and fewer people would ask to have the goods instead of the money, and so you could reasonably put up the value of your cash, making you worth more and have more buying power.
Crashes would occur when lots of people with your money out in the world want to get the real goods (based on events within the civ) and find out that you haven't got them. If there is ever a point at which you can't hand over the things that your money is backed with, all your money becomes worth zero, your fortress wealth decreases appropriately, you get bad thoughts (maybe even war for screwing up some other civ's economy) and a host of other bad things, not to mention that trust in any further currency you mint will be basically zero and you'll be back to trading with standard goods.
Now, the penalty of trading with standard goods would come with wildly fluctuating supply and demand. If you trade in minted coins, you'll have t pay a little extra to get what you want, but you could always boost the value of your coin for a little while to get it. trading in raw goods (the traditional way) would require closer management of supply and demand. If you've got loads of mugs, but they need tables then you're a bit stuffed. Now, if only you had those shiny platinum coins to get over the trading hiccup...
Of course, this is open to abuse by players wanting to get more for their fortress. A player could up the value of his coinage temporarily, buy out a caravan and then set the value back to normal afterwards to make sure that he isn't caught out and crashed. To prevent such underhanded tactics, I would advise one of two solutions:
A: All coins of a certain year would be fixed. A Year 226 Dwarf bronze coin is worth 20. It's got 20 worth of backing now, 20 worth in a year and 20 worth in 40 years. This way coins will be open to change every year, but once you've made your decision, it's final. This would also mean that minting too many coins could bring on a crash, because if you have 50% of your coins being turned in for goods (for example, 40 coins) at once , and each coin is worth 20, then you have to turn over 40x20=800 value of backing goods. If you've got 50%, but less coins (20) then you only need to have 400 worth of backing goods.
The benefit to having lots of coins out will be explained later.
B: Coins could only change once a season. This would mean that any coinage change would have to be upholdable for an entire season. People would come and ask for the backing goods during that season, and if you were too greedy with your trading, then that's your fault.
The various influences on coins...
+ Good influences on your currency trust
1:Every time a trade is done in your currency (lots of coins means lots of trades. Having pence won't help though, because people will just opt to trade in greater value currency where possible)
2:Every time you give an offering of coins to another civ (will lead to 1: as well, you trade short term having money for long term security)
3:Every time you win a war, or some other epic event. People put trust in your currency because you are successful and victorious (it works, honest).
4:Every time you successfully meet a demand for backing goods. Seeing that you aren't just faking will boost trust.
- Bad influences on your currency trust
1: Losing any outpost. With the army arc coming up, we may be able to lose branches without losing the fortress proper.
2:Not using your currency in trades. What, do you not trust your own money?
3:Large amounts of dwarves dying. opposite of the other 3:.
4:Failing to produce the requisite backing goods upon request (read: instant crash).