There's an amphitheater, a place where a hundred of the stone walkways twine around to create space for a hundred thousand people to sit in close proximity, and someone is giving a lecture or a demonstration at the base of it, the seats closest to him filled with eager, tiny, bearded Dwarf-children.
And they spiral down, and down, and down, past waterfalls and egg-sized gemstones left half in the rock and halls of crystal. Everything grows gradually more ornate and more perfectly maintained and the clang of hammers fades behind them. "People say," her guide says, "that we only have a council instead of a single King because there were nine winners of the competition to design the throne so we couldn't just select one person to sit it." And they push open the doors to reveal, indeed, nine thrones so elaborate it would be hard to choose between them, and nine squat bearded people sitting them.
"They have swords and bows. It'd be a long trade route, although it sounds like you're accustomed to those; and they haven't asked about it but may not have known it was an option."
"In brief, fiat currency is a system where it is customary to trade arbitrary things for various quantities of IOUs - usually not of favors; most places get this system off the ground by backing the currency in something concrete and scarce, but once it's underway it can actually be backed by nothing at all but the sheer momentum of the system and some anti-counterfeit measures."
"That's why you need anti-counterfeiting, and to be very careful with the sorts of institutions that may spring up to do arbitrage and lending and storage. The advantage of the system is that if one person has something another wants but the first person doesn't want anything the second has, the fiat currency is universally desirable and there's no need to run a series of errands trying to find something agreeable and comparable in value. They can just settle on a number."
"Gold's a fine thing to back it with starting out; fiat can be made much easier to transport and allows you to eventually inflate to accommodate greater total wealth in the system even if you don't happen to find gold ore at a convenient rate."
"Good idea. Any other questions before I go dump science and econ on an amphitheater full of Dwarves?"
She inclines her head. She thinks she remembers the way to the amphitheater.
Physics and engineering and metallurgy and economics! Visual aids! Wheeeeeeee!
She attempts to call on people and answer their questions fast enough to prevent an outbreak of violence.
These are such adorable economist dwarves. She will happily give precedence to the highest bidder once she figures out how that works.