9. Money
Introduction In the old days, human life was not as complex as it is today. People were self-dependent because there were a few basic needs to satisfy such as food, clothes, and shelter. With the passage of time and modernization, human wants multiplied. As a result, self-sufficiency came to an end and the process of exchange started, under which people exchanged their commodities for other required commodities. This system is called barter system and the economy is called barter economy. After a long time, because of various difficulties of barter system, money emerged as a medium to make exchange easy or avoid the difficulties of barter system.