Revision Notes https://byjus.com/cbse-notes/class-10-social-science-economics-chapter-3-money-and-credit/ .In the early times, people used to exchangs one commodity for another depending on their requirement under the barter system. However exchanging goods in the barter system required a double coincidence of wants .However, money eliminates the need for double coincidence of wants. Since money enables the exchange process, it is also called a medium of exchange .Money is anything which is commonly accepted as a medium of exchange and in the discharge of debts .Before the introduction of coins, a variety of objects were used as money. For example, since the very early ages, Indians used grains and cattle as money Thereafter the use of metallic coins-gold, silver copper coins came into existence. *Modern currency: .Uses paper notes and coins made of relatively inexpensive metals. .Has no value of its own. .Has a value only because it is authored by the government of the country .I...