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Europe went through equally dramatic changes after 1955. Cases 1 and 2 show that the labor effects of mechanization depend on the alternatives available to the economy. The Indian Punjab provides an opposite example. The green revolution initiated in the mid-1960s led to sharply increased demand for labor, which caused a big rise in real wages around 1968 (Gupta and Shangari 1979).

Because India's economy was growing slowly, a slower rate of mechanization and a larger volume of migration could have solved the labor shortages in Punjab at a lower capital cost. And the extra employment would have meant that the benefits of the green revolution were shared more widely with workers in poorer regions.

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Such machinery has facilitated the full or partial replacement of human- and animal-powered equipment in developed countries and increasingly in developing countries as well. The net result has been higher productivity and the welcome elimination of much of the drudgery of manual farm labor. For example, one person involved in agricultural production can now provide enough food and fiber for 128 others whereas only a century ago one person could provide food and fiber for only eight others (see also, Technology and Power in Agriculture).

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Furthermore, the development of sub-soilers to break up soil pans (highly compacted layers of soil interfering with water movement and deep crop root development) would not have been possible without the power capability of the modern tractor. Likewise, the ability to improve soil drainage (in excessively high moisture soils) through tractorized mole drainage systems would not have been possible with animal power alone.

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