In calculating the quantity of chain will be added to prices used as weights to calculate every year, thus making the problem caused by the staggering price of goods including the calculation of the quantity of chain can also add information about the activities. A new type of product to be throughout the series. It is possible to reflect changes by the passage of time. Therefore, the calculation of the quantity of chain will have the precision in the calculation of the rate of economic growth for more than a year of constant calculation base is the major reason that causes various countries. Consider the change a quantity calculation chain, instead of a fixed base year.
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