2 Value added and gross product originating are measurements of the same factors from different points of view. Theoretically they should be equal.

3 This gives the year by year difference between value added and gross product originating in dollars.

Theoretically National Income account (NIA) and BLS figures should be equal. Both figures represent standard statistical sources.

This is a measure of the change in productivity year by year. Addition of the individual figures gives overall change in productivity.

2 GPO output per hour worked.