Is it different from a "shop"? That is, is it a specific place where arbitrage trading takes place, but different from where one would go to get a backpack and a 10-foot pole?
I envision a market as a crowded place where people do their shopping, but if that's different than an "arbitrage market", what does an "arbitrage market" look like, and where would it be held, and how would they enforce the toll?
If it's the same, do I have to pay the toll to be able to shop for some rations and a bundle of torches?
I'm basically a little fuzzy on where "arbitrage" meets "shopping".