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Productivity-improving technologies date back to antiquity, with rather slow progress until the late Middle Ages. Important examples of early to medieval European technology include the water wheel, the horse collar, the spinning wheel, the three-field system (after 1500 the four-field system—see crop rotation) and the blast furnace.
Gordon J. Bjork points out that manufacturing productivity gains continued, although at a decreasing rate than in decades past; however, the cost reductions in manufacturing shrank the sector size. The services and government sectors, where productivity growth is very low, gained in share, dragging down the overall productivity number.
It attempts to explain long-run economic growth by looking at capital accumulation, labor or population growth, and increases in productivity largely driven by technological progress. At its core, it is an aggregate production function , often specified to be of Cobb–Douglas type, which enables the model "to make contact with microeconomics ".
Furthermore, if the productivity growth differential persists (that is, the low-productivity-growth sectors continue to see low productivity growth into the future while high-productivity-growth sectors continue to see high productivity growth), then costs in low-productivity-growth sectors will rise cumulatively and without limit.
Increases in productivity lower the real cost of goods. Over the 20th century, the real price of many goods fell by over 90%. [14] Economic growth has traditionally been attributed to the accumulation of human and physical capital and the increase in productivity and creation of new goods arising from technological innovation. [15]
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Productivity is the efficiency of production of goods or services expressed by some measure. Measurements of productivity are often expressed as a ratio of an aggregate output to a single input or an aggregate input used in a production process, i.e. output per unit of input, typically over a specific period of time. [1]