it would fall under the category of "trading" and it would be the first step to chaos. please do not implement trading into the game, it causes enough drama in other games and is the root of evil.
Yes, the world of Arie is a communist state led by great party leader Bjorn Mirwais. As such, capitalist ventures and economic activities which have the trappings of capitalism is strictly forbidden. In fact, capitalist greed is what caused all the trouble in the land when the demon lords began reanimating corpses in a way to acquire more human capital.