Demand is the quantity demanded at any one time. By such requirements must be need, can afford (willingness to pay) or to a demand potential (effective. Demand).The demand is significantly negative relationship with the price level, i.e., when the price level increases. The needs that kind of goods will be reduced. However, the demand of this kind may be used with both individual and national level.Aggregate demand (aggregated demand), which means the demand for goods and services throughout the country (Macroeconomics)
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.Supply is the quantity sell a product at any one time (and must have the ability to manufacture ปริมาณสินค้า in production level are offered for sale). Supply in here may be used to mean a production unit, manufacturer.That is to say, when price level is increased. The seller is willing to sell a product volume increase.
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