o "Money in a mechim g exchange for more than and Services. Today the most comme Domaty used objects are metal cering and paper balls all 9 azhich are called monary era, arter system 2 exchange existed in which foods and services as it duenato necelare todas traded threctly for other Estate What is the historical background 9 money to the state the functions and characteristics to the pre-cyliu tim pera medes and preside the advantages and disadvantages. 2 ble proprietorship