"central authority is necessary for money to work" - No I don't mean "central authority" just some authority that is responsible for "following the rules" in gi

"central authority is necessary for money to work" - No I don't mean "central authority" just some authority that is responsible for "following the rules" in given market. This can be a company that issued virtual money in online game for example. If participants in virtual world do not trust in the fact that the company will play fair game (e.g. that all participants in the virtual game will have equal power to trade, and that the quantity of money and quantity of virtual goods will grow by some known way.), then the virtual money value will decrease.