What I don't think would be a good idea is any sort of walrasian modeling of fortress mode. To put it simply, that's kind of the game, isn't it? To me fortress mode has always been throwing down the gauntlet to all those who claim that the 'benevolent dictator' is a reasonable way to run a society. It's clearly not, and DF makes this case in spades.
That’s so true, isn’t it? The way the player walls in the vampire so he can become their never-sleeping manager or walls out the last two dwarves to die by goblin because they’ll get there too late and they’re too slow and they’re nothing more than useless Legendary Stonecrafters anyway or walls in the three people who got bitten by the werelizard, gives them no food and water because they’ll regenerate every month anyway, and then releases them on the invading goblins to die when the time is right, for the good of the Mountainhomes and the Crying Melons, just destroys the idea of a benevolent dictator. It would be even worse if the player was physically a dwarf who could die, because they’d do anything at all to save themselves.
I mean, maybe we do all this because it’s !!dwarfy!! and efficient and they’re all just little bearded smiley faces and binary anyway, but still.
Still.
Edit
Oh and for the record and to be at least slightly on-topic the economy sounds like a terrible idea, to me, at least without a worldwide economy first to give it meaning.