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Bartering means that you trade. For example if there is a cook and a shoe maker the cook trades a soup for shoes. Its really hard to trade.
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People used to use cowrie shells instead of money. They used cowrire shells because they did 'ent have money .But why did they use only cowrie shells? They could use other shells too!
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The first known paper banknotes apperd in China.
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Credet cards are verey inportant because if you want to buy something you can use your credit card instead of cash.But if you can't afford that thing the cashier cuts your credit card.
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Now they make money. It's very inportant to use money because we need to survive so we can buy food and water.
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Today its not that hard because we have money. But in the old times they had to trade and buy and sell things to get money.