The cost of birch-bark rope is 2 ropes = 1 arrow
The problem is that when you cut a 15 ft rope into 15 peices its price essentially is multiplied by 15.
After cutting it up you can trade 2 pieces of 1-foot rope for 1 arrow, which is ridiculous considering how quickly you can make a lot of rope (even though you can only do that during the early summer).
I really love the realism of the game, and I love how challenging everything is, but once I find an exploit like this I can't Not use it.
Please fix it quick! I quickly fell in love with this game even though i've been playing it only for a week or two. And this bug breaks the immersion for me.