Dig some dirt.
Hold the dirt in your hand.
/am sell 5
(sell these dirt at the price of 5$ each dirt block)
/am buy default:dirt 1 5
(buy 1 dirt block at the price of 5$, in this case the deal is then concluded)
(the dirt is in your "buffer", and you use this command to put it back into your inventory.)
Buy low , sell high and maybe become a monopoly! :D
This mod is still WIP and has many bugs to be fixed :P
Added vieworder (/am vieworder)
Added cancelorder (/am cancelorder <order_number>
Added viewlog (/am viewlog)
Added getname (/am getname) to get the engine name of the item you're holding, like default:dirt.
A diagram to help you understand all the stuff: