diminishing returns

1. any rate of profit, production, benefits, etc., that beyond a certain point fails to increase proportionately with added investment, effort, or skill.

2. Also called law of diminishing returns. Econ. the fact, often stated as a law or principle, that when any factor of production, as labor, is increased while other factors, as capital and land, are held constant in amount, the output per unit of the variable factor will eventually diminish.

[1805-15]

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▪ economics

also called  law of diminishing returns  or  principle of diminishing marginal productivity  

      economic law stating that if one input in the production of a commodity is increased while all other inputs are held fixed, a point will eventually be reached at which additions of the input yield progressively smaller, or diminishing, increases in output.

      In the classic example of the law, a farmer who owns a given acreage of land will find that a certain number of labourers will yield the maximum output per worker. If he should hire more workers, the combination of land and labour would be less efficient because the proportional increase in the overall output would be less than the expansion of the labour force. The output per worker would therefore fall. This rule holds in any process of production unless the technique of production also changes.

      Early economists, neglecting the possibility of scientific and technical progress that would improve the means of production, used the law of diminishing returns to predict that as population expanded in the world, output per head would fall, to the point where the level of misery would keep the population from increasing further. In stagnant economies, where techniques of production have not changed for long periods, this effect is clearly seen. In progressive economies, on the other hand, technical advances have succeeded in more than offsetting this factor and in raising the standard of living in spite of rising populations.

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