think about a village that treats a particular kind of wood used in ritual ceremonies - like weddings and funerals - as a kind of currency. the person who bears that currency has a kind of ritual power but it’s limited in scope. a young man who trades years of labor to acquire a single stave can burn it in order to declare his worthiness to marry a woman of the tribe. if one person simply “buys up” all of the available supply… how? it’s a ritual item - they’re literally not for sale in the traditional sense. that is, it’s not money because it’s not a commodity.
another kind of currency is IOUs issued by a particular person - they’re only valuable to you if getting a favor done by that person carries some kind of significance to you. that is, they can be traded like commodities within a community but hold no value outside of it.