Since the various civs use different coins, how will the exchange rate work? Won't mining out a gold vein and turning it to coin completely ruin world trade? If the value of a precious metal or any otherwise stable, in-demand commodity suddenly drops on the market, that would cause a crash across the board in the real world. How do you envision this working in DF? Will the civs invent fiat currency to overcome this crippling instability? I'm sure that the human traders wouldn't like having their economy rest on the competence and whims of the mining dwarves.
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Are you planning on adding any cool economics screens for legends mode that show the basic GDP of each civ, in commodities produced, (I guess GDP is an inaccurate term since the value of services would be too hard to track) or maybe even the value of all goods produced in relation to the value of their coin? (I'll have like 50 nerdgasms in a row if you answer yes, so don't disappoint me.
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Will this game ever have any banks?
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The trading arc has so much more potential than just being a silly excuse to fly spacetrucks around, buying low and selling high. I think that this would be something that's nearly impossible to model right, but who the crud wouldn't want to play the speculation game based around political instability, dwarven ore mining, and harvest weather predictions inside of DF? Maybe an honest merchant won't pay the goblins off to ambush the elven food caravans this year, flooding the market with cheap food?