government uses this convention so that quarterly and annual figures on GDP can
be compared more easily.
In addition,
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after they have been modified by a statistical procedure called seasonal adjustment.
The unadjusted data show clearly that the economy produces more goods and
services during some times of year than during others. (As you might guess,
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December's Christmas shopping season is a high point.) When monitoring the
CHAPTER 22 M E A S U R I N G A N AT I O N ' S I N C O M E 499
condition of the economy,
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