This technical note provides background information about the source data and 
estimating methods used to produce the estimates presented in the GDP news release. 
The complete set of estimates for the first quarter is available on BEA's Web site at 
www.bea.gov; a brief summary of "highlights" is also posted on the Web site.  In a few 
weeks, the estimates will be published in BEA's monthly journal, the Survey of Current 
Business, along with a more detailed analysis of the estimates ("GDP and the 
Economy").  


Sources of Revision to Components of Real GDP
     
Real GDP growth in the first quarter (that is, from the fourth quarter to the first) was 1.0 
percent (annual rate), which was 0.1 percentage point more than the preliminary 
estimate.  Upward revisions to exports, to consumer spending, and to business fixed 
investment were partly offset by an upward revision to imports and a downward revision 
to inventory investment:

     *   The upward revisions to exports and to imports primarily reflected the
         incorporation of the annual revision of the international transactions accounts on
         a best-change basis.
     *   The largest contributor to the upward revision to consumer spending was medical
         care services, which reflected the incorporation of newly available first-quarter
         and revised fourth-quarter data from the Census Bureau quarterly services
         survey.
     *   The largest contributor to the upward revision to business fixed investment was
         prepackaged software, also reflecting the incorporation of the Census Bureau
         quarterly services survey.
     *   The largest contributor to the downward revision to inventory investment was
         "mining, utilities, and construction inventories," reflecting the incorporation of
         Census Bureau quarterly financial report data for mining and Energy Information
         Administration data for utilities.

The price index for gross domestic purchases increased 3.6 percent in the first quarter, 
which was 0.1 percentage point more than the preliminary estimate.  The revision 
primarily reflected an upward revision to the price of medical care services in consumer 
spending, which was based on a revised Bureau of Labor Statistics producer price index 
for physician services. 


Corporate Profits

Profits from current production decreased $5.2 billion, or 0.3 percent (quarterly rate), in 
the first quarter, in contrast to an increase of $5.2 billion in the preliminary estimate.  
Profits of domestic corporations increased $17.6 billion, and rest-of-the-world profits 
decreased $22.8 billion in the first quarter.  Profits tax liability decreased $32.6 billion, 
reflecting the bonus depreciation provisions of the Economic Stimulus Act of 2008 (see 
the GDP news release), and profits after tax from current production increased $27.3 
billion, or 2.5 percent.


                      Annual Revision Scheduled for July 31

The GDP news release on July 31 will present the regular annual revision of the national 
income and product accounts, covering the estimates from the first quarter of 2005 
through the first quarter of 2008, as well as the advance estimates for the second 
quarter of 2008.  The revision will incorporate source data that are more complete and 
more detailed than those previously available, including: 
	
     *   Census Bureau annual surveys of manufactures, of merchant wholesale trade, of
         retail trade, of services, and of state and local governments;
     *   BEA international transactions accounts data;
     *   Federal government budget data;
     *   Internal Revenue Service tabulations of tax returns for corporations and for sole
         proprietorships and partnerships; and
     *   Department of Agriculture farm income statistics.

The annual revision will also incorporate refinements to estimating methodologies, 
including the following: 
	
     *   Within personal consumption expenditures for goods, the estimates of the
         composition of goods sold in grocery stores will be based on scanner data from a
         trade source.  (The value of total sales of grocery stores, however, will continue
         to be based on Census Bureau monthly and annual surveys of retail trade.)  The
         use of scanner data will improve the accuracy of these detailed estimates.

     *   Within personal consumption expenditures for services, the deflator for domestic
         airline services will be based on the BLS producer price index (PPI) for domestic
         scheduled passenger air transportation.  The deflator for passenger travel abroad
         by U.S. residents on U.S. carriers will be based on the BLS PPI for international
         scheduled passenger air transportation (on U.S. carriers).  The BLS PPIs reflect
         a new and improved methodology that provides more accurate estimates of
         airline prices.  Currently, the deflator for domestic airline services is based on
         cents-per-revenue-passenger-mile data for domestic carriers from a trade
         source.  The current deflator for passenger travel abroad by U.S. residents on
         U.S. carriers is based on the BLS import price index for air passenger fares.

Brent R. Moulton  
Associate Director for National Economic Accounts
Bureau of Economic Analysis  
(202) 606-9606

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