Likely wont be coming to your fortress, likely won’t be coming anywhere that isn’t on a shoreline in a warm place,
maybe not even in this country
LOL at concept there won’t be anyone anywhere to trade shiny metal world-recognized denomination currency for other things
people looking to trade ammo will looking for traders with a certain type of weapon, a rather limited market, and how far from their fortresses and by what mode of transport are they going to travel to barter ammo?
the people looking to trade for seeds are those not hungry now, those who have 3 months with time and place, weather conditions and safety to plant a garden, water it, and defend it. Again, a rather limited market....your needs and those of your trade partners will be rather small isolated groups, which is probably fine for your situation, if you have thought it through and things go as you expect weather and safety wise and there is no need to change your plans, I always expect the worst, which is the unexpected
“by what mode of transport are they going to travel to barter ammo?”
Reminds me of the trade routes for obsidian to make tools and arrowheads. Researchers can track a sample back to the volcanic source, using chem and spectro analysis.
Seems like they find Calif desert rock all the way to the Pacific coast.