On July 31, the US Bureau of Economic Analysis (BEA)
revised its GDP methodology. The published GDP and real GDP for each year going back to 1929 has changed. For instance, the GDP for 2012 under the new methodology was reported as $16,244.6 billion; under the old methodology the GDP for 2012 was $15,684.8 billion.
Presumably, BEA will update its
state GDP methodology when the 2013 numbers come out next June.
Presently, usgsovernmentspending.com uses
Table 10.1 in the
Historical Tables of the Federal Budget for projected GDP and
measuringworth.com for historical GDP. We use measuringworth.com because its data series goes back to the 1790s.
We can't change to the new series yet because Table 10.1 won't get updated until the new FY15 budget comes out early next year. If we changed right now there'd be a nasty jog in the data between historical and projected GDP. Not good. So for the present we are using the old GDP series at measuringworth.com and the current FY14 version of Table 10.1
When we do change, we'll use measuringworth.com for GDP from 1792 to 1928; we'll use the BEA GDP from 1929 to the present. And we'll use Table 10.1 in the Federal Budget for projected GDP.
