Consequently, the upward surge in the CPI during these years in response to increased energy prices greatly exaggerated the actual rate of inflation faced by a typical urban family. Since GDP does not include imports and consumption C does, the GDP implicit price deflator will differ from the consumption deflator in years when there are large shocks to import prices. The survey excludes farm employees and the self-employed. Currently in the U.S. the natural rate of unemployment is calculated to be about 6 percent. More precisely, employment is high when real GDP is high relative to potential real GDP, and vice versa.
Productivity is the amount of output produced per unit of input.
This slowdown in productivity is an ongoing puzzle.