Footnotes, Tables 1-4

Source:  The Bureau of Labor Statistics (BLS) develops productivity measures 
using output and compensation data published by the Bureau of Economic 
Analysis (BEA), hours data published by other BLS programs, and capital data
supplied by BEA and U.S. Department of Agriculture.  Also see Technical Notes
in this release.

(1) The private business sector includes all of gross domestic product except
    the output of general government, government enterprises, non-profit 
    institutions, the rental value of owner-occupied real estate, and the 
    output of paid employees of private households.  The private nonfarm 
    business sector also excludes farms but includes agricultural services.

(2) Output per unit of combined labor input and capital services.

(3) Gross domestic product originating in the sector, chained superlative 
    index.

(4) Index of hours at work of all persons including employees, proprietors, 
    and unpaid family workers, classified by age, education, and gender.  
    This chained superlative index is computed by combining changes in the
    hours of each age, education, and gender group weighted by each group’s 
    share of the total wage bill. 

(5) A measure of the flow of capital services used in the sector.  Capital 
    services measure the services derived from the stock of physical assets
    and software.  The assets included are fixed business equipment, 
    structures, inventories, and land.

(6) The growth rates of labor input and capital services are combined by
    weighting with their respective shares of current dollar costs, and 
    aggregating into a chained superlative index.