Mnemonics is device to learn easily by association or poem etc. For example, I often forget name of Vatika shampoo. So, I just recall my own name, which is same meaning as Vatika. For functions of money, there is poem- Money is a matter of functions four- a medium, a measure, as standard, as store. For remembering attributes of what constitutes good money, there is a word- CUPDISH, meaning cognizable, utility, portability, divisibility, indestructibility, standard, and homogeneous