well here is how it works first to start off you buy however many supps you want of yew longs. then in world 132 yanille bank, you make the longs then people will do supps for longs. Or if there isn't anyone you say longs for supps. People will trade you how ever many supps for your longs. For example trade 2k yew longs for 2k yew longs and 2k bowstring. But the best thing about it is every time you trade for supps you get cash too!