What kind of volume of goods and services that is one of the need to purchase at various prices of goods, within the specified period of time, which also assumes that other factors that determine the demand that would be required to have the needs of the purchasing power.but there is a need for the product, there is no money to pay for the need to purchase we call it "the way you want to (want) ", not "supply and demand (want) ." So, elements of supply and demand will be combined with the need to purchase and power
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