Answers

2016-01-21T19:00:12+05:30
At earlier time there used to be barter system. So because of this system people used to face many problems in buying goods. So a common medium of exchange was introduced so that everyone could buy their necessity easily. So the trade was done in this medium called money. As development increased new currency were made but still dollar is the global currency in international market.
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2016-01-21T19:00:26+05:30
Because it is authorised by Central government and now modern currency were made in coin and notes.
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