Total factor productivity
In economics, total-factor productivity (TFP), also called multi-factor productivity, is a variable which accounts for effects in total output not caused by traditionally measured inputs. If all inputs are accounted for, then total factor productivity (TFP) can be taken as a measure of an economy’s long-term technological change or technological dynamism.
The equation below (in Cobb–Douglas form) represents total output (Y) as a function of total-factor productivity (A), capital input (K), labor input (L), and the two inputs' respective shares of output (α and β are the capital input share of contribution for K and L respectively). An increase in either A, K or L will lead to an increase in output. While capital and labor input are tangible, total-factor productivity appears to be more intangible as it can range from technology to knowledge of worker (human capital).
Technology Growth and Efficiency are regarded as two of the biggest sub-sections of Total Factor Productivity, the former possessing "special" inherent features such as positive externalities and non-rivalness which enhance its position as a driver of economic growth.
Total Factor Productivity is often seen as the real driver of growth within an economy and studies reveal that whilst labour and investment are important contributors, Total Factor Productivity may account for up to 60% of growth within economies.
It has been shown that there is a historical correlation between TFP and energy conversion efficiency.
- Y: widgets/year (wid/yr)
- L: man-hours/year (manhr/yr)
- K: capital-hours/year (caphr/yr; this raises issues of heterogeneous capital)
- α, β: pure numbers (non-dimensional), due to being exponents
- A: (widgets * yearα + β – 1)/(caphrα * manhrβ), a balancing quantity, which is TFP.
The units of A do not admit a simple economic interpretation, and the concept of TFP is accordingly criticized as a modeling artifact.
As a residual, TFP is also dependent on estimates of the other components. A 2005 study on human capital attempted to correct for weaknesses in estimations of the labour component of the equation, by refining estimates of the quality of labour. Specifically, years of schooling is often taken as a proxy for the quality of labour (and stock of human capital), which does not account for differences in schooling between countries. Using these re-estimations, the contribution of TFP was substantially lower.
 See also
 Further reading
- Hulten, Charles R.; Dean, Edwin R.; Harper, Michael J. (2001). New Developments in Productivity Analysis: Chapter: Total Factor Productivity: A Short Biography; Sponsored by: National Bureau of Economic Research. University of Chicago Press. pp. 1–54. ISBN 0-226-36032-68 Check
|isbn=value (help)<Chapter by Charles Hulten>
- Ayres, R. U.; Ayres, L. W.; Warr, B. (2002). Exergy, Power and Work in the U. S. Economy 1900-1998, Insead’s Center For the Management of Environmental Resources, 2002/52/EPS/CMER
- (Barnett 2007, p. 96)
- "Human Capital and the Wealth of Nations" (pdf). May 2006. Retrieved 2006-11-02
- Ayres, Robert U.; Warr, Benjamin (2004). Accounting for Growth: The Role of Physical Work
- Ayres, Robert U.; Warr, Benjamin (2006). Economic growth, technological progress and energy use in the U.S. over the last century: Identifying common trends and structural change in macroeconomic time series, INSEAD
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