The reason for this is that gross domestic product is such a hugely complicated thing to measure that there are sure to be mistakes made when calculating it.
When you calculate GDP using the income method, you tend to get a different result than you get using the expenditure method. This is, again, just because of how complicated it is to measure all this data.
The statistical discrepancy is just half of the difference between the two measures. So, in other words, if one measure said GDP is $10.1 Trillion and the other said it is $10.3 Trillion, we halve the difference and say that it is really $10.2 Trillion.
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