1. the system of Exchange (Barter System).What is exchanged between people's needs matching, such as rice with pork and redeemed? Bring eggs to fish. In practice, there are various barriers occur include several reasons.1. the issue is people's needs do not match.2. problems with Exchange rates or pricing.3. the transport problems4. storage problems5. problems with loan repayment and6. There are some problems with the segregation of units do not.
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