Diminishing returns

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law of diminishing returns,

also called 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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The concepts of diminishing returns and optimizationDevelopment of theories of economics

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“diminishing returns, law of” Britannica Online.
[Accessed 09 May 1998].