Limited monitoring and the essentiality of money

Monetary theory emphasizes that imperfect monitoring is necessary for money to be essential, that is, for money to achieve socially desirable allocations. Little is known about how limited monitoring must be if money is to be essential, though. Understanding sufficient conditions for the essentiality of money is important since monitoring is a natural way in which credit is introduced in monetary models. In this paper, we show that money can fail to be essential even if monitoring is quite limited. This indicates that one must be careful when introducing monitoring in monetary models to allow for the coexistence of money and credit.