U.S. Bureau of Labor Statistics
Sources and footnotes for tables
Last Modified Date: December 16, 2013
SOURCES: Output data are from the Bureau of Economic Analysis and the
Census Bureau of the U.S. Department of Commerce; the Bureau of Labor
Statistics, U.S. Department of Labor; and the Federal Reserve Board.
Hours and compensation data are from the Bureau of Labor Statistics and
the Bureau of Economic Analysis.
RELIABILITY: Productivity and cost measures are regularly revised as more
complete information becomes available. The measures are first published
within 40 days of the close of the reference period; revisions appear 30
days later, and second revisions after an additional 60 days. In the
business sector, the third publication (second revision) of a quarterly
index of output per hour of all persons has differed from the initial
value by between -1.6 and 1.5 index points approximately 95 percent of
the time. This interval is based on the performance of this measure
between the fourth quarter of 1995 and the second quarter of 2013.
(1) Wages and salaries of employees plus employers' contributions for
social insurance and private benefit plans. Except for nonfinancial
corporations, where there are no self-employed, data also include an
estimate of wages, salaries, and supplemental payments for the self-
(2) The change for recent quarters is based on the Consumer Price Index
for all urban consumers (CPI-U). The trend from 1978-2012 is based on the
Consumer Price Index research series (CPI-U-RS).
(3) Unit nonlabor payments include profits, consumption of fixed capital,
taxes on production and imports less subsidies, net interest and
miscellaneous payments, business current transfer payments, rental income
of persons, and the current surplus of government enterprises.
(4) Current dollar output divided by the output index.
(5) Quarterly changes: Percent change compounded at annual rate is
calculated using index numbers to three decimal places. Indexes published
in the news release are rounded to one decimal place for convenience.
Annual changes: Percent change is calculated using annual indexes to three
(6) Unit nonlabor costs include consumption of fixed capital, taxes on
production and imports less subsidies, net interest and miscellaneous
payments, and business current transfer payments.
(7) Total unit costs are the sum of unit labor and nonlabor costs.
(8) Unit profits include corporate profits before tax with inventory
valuation and capital consumption adjustments.