Cheapest country in the world to travel for Money has three useful functions: unit of account, store of value, and medium of exchange. The latter is the most pertinent, although money as a store of value plays a crucial role in MACROECONOMICS. One of the most important issues in the theory of money concerns its quantity and its relation to the general price level. Money as unit of account reduces the problem of relative prices because money serves as the numraire in which the prices of all goods can be expressed. This role is the least important and does not give money its distinct character for any good can serve as a numraire. Money also serves as an asset that people can use to store value. It is like other financial assets in this regard, except that it generally does not earn interest. Cheapest country in the world to travel 2016.