In this question, I introduced the concept of a fantasy creature that is basically a sentient badger. I haven't yet named these things, so let's just call them badgers, with the understanding that these are Cobaltduckworld's badgers, not Earth's.
A delegation of humans is arriving at the mouth of the badgers' cave system to engage in friendly commerce. The badgers have brought several carts full of mineral ore- lead, iron, tin, silver. There are also some samples of their unique art- figurines carved from tree roots using only their own claws. The humans value the ore- they can refine it and ultimately make jewelry, tools, fine tableware. Likewise, badger art is all the fashion in high society these days.
Of course, the humans could have just dug up the ore themselves, but that would totally enrage the badgers. Instead, the two species mutually agree to a trade deal, because we offer them .... ?
What is it the humans have brought to the negotiations? What wares fill their wagons? What is it that they have that the badgers can't get themselves? What motivates a badger to labor in the mines, then venture forth out of the sett, into the harsh light of the surface, there to engage these foul-smelling hairless apes?
What, in short, is a mustelid's macguffin?
EDIT/BACKGROUND per some commenter's request.
The overall social/ technological development phase of this world is comparable probably to early 1800s Earth. Well beyond medieval, just before steam, definitely not modern. However, no gun powder.
The badgers are reasonably dexterous (as discussed in my earlier question) and do fabricate their own tools. They do not wear clothing. Their preferred foods are readily available to them- grubs, tubers, smaller burrowing creatures (i.e. "My grandmother makes an excellent pocket gopher stew, with carrots, potatoes, and a generous side portion of three-larva salad. Mmmm.....").