User blog comment:D2r/Unanswered Questions of Redwall/@comment-1479469-20100910212944

@Unreg: But it's not specified in the books. The barter system would obviously work for trade - but no trade is described, except for merchant ships once in a while. Which doesn't explain how land areas get their supplies. Further - if they're just swapping goods, what's being swapped for what?