1. a system of exchanges (Barter System).Is to be exchanged between people who have needs for example, rice picked up with pork? Bring the eggs, picked up the fish. In practice, there are problems and obstacles arise for several reasons include:1. the problem of mismatch of people's need.2. problems with Exchange rates or pricing.3. the transport problems4. storage problems5. problems with the loans and debts.6. problems with some of the things the separation unit not.
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