U.S. quarterly seasonally adjusted annual growth rate for GDP for the second quarter 2015 is revised to 3.7% growth from the earlier forecast of 2.3%. The first half GDP growth is still low at 2.2% because of a weak first quarter in 2015. Consumer spending representing two thirds of economic output was up 1.8% in the 1st quarter, and 3.1% in the second quarter of 2015. Another factor relevant to economic growth is gross domestic income or GDI, GDP uses expenditures data and GDI uses income data. GDI was up 0.6% for the second quarter 2015, an average of the GDP and GDI numbers provided by the Commerce Department shows a 2.1% annual growth for the U.S. economy for the second quarter.