When the economy began to grow more and more forms of exchange of goods and services have evolved from the redemption of (Barter System) is a system of money (Money System) as a medium of exchange is an important one. To facilitate the exchange of goods and services. In addition, money also plays a major role in the economy because the money supply (Supply of Money) in the economy, changes will affect the interest rate, which is a factor in determining investment and affect productivity, income and employment. collective economy
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