I'm pretty sure it depends on the region that is under control by the country. Just like how some npc vendors will say something like "I want to import from this region, but we don't have it under control", whoever has the area that Silver Arrows can by imported from, gets silver arrows. But what area this is, I'm not sure.
Most likely it is on the Quon (sp?) continent since Bastok and San d'Oria are where Silver Arrows are usually found.
It's just like how if your nation is in last (has least regions), your weapon shot won't have many weapons (least places to import from). I'll try to compair the regions under control when San has the arrows to when Bastok does the next time it happens, I'll post if I find out anything.
I think it makes sense, but I still could be wrong.
** Sorry for being off-topic ><
Edited, Sat Feb 21 04:01:22 2004 by RKenshin
+ 12BLM, 10WHM, 2 RDM! lolmage
Merit 405~ lolLJ