The upward revision from the 2.6 percent Pace reported last month reflected robust consumer spending as well as strong business investment.
"The impact on the national economy will be minor," said Gus Faucher, chief economist at PNC Financial Services in Pittsburgh.
Strong growth and a labor market that is near full employment support views the Federal Reserve will announce a plan to start unwinding its $4.2 trillion portfolio of Treasury bonds and mortgage-backed securities next month and increase interest rates in December.
The Fed's preferred inflation measure, the personal consumption expenditures (PCE) price index excluding food and energy, increased at a 0.9 percent rate as previously reported.
Inventory investment had a neutral effect on second-quarter GDP as previously reported after chopping off 1.46 percentage points from output in the first quarter.
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