diminish

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diminishing returns

1. In economics, a yield rate (i.e., of profits, production, benefits, etc.) that fails to grow in proportion to the amount of investment, skill, time, or effort that is added. The restaurant, to combat high volumes of customers, hired a large surplus of wait staff and cooks. This led to diminishing returns, however, as the overcrowded staff was far less efficient and eventually cost the restaurant more in wages than it was earning.
2. By extension, any output or results (e.g., of a product, project, organization, etc.) that fail to increase proportionally to additional time, money, skill, or effort. Unfortunately, the show's charm has not lasted, and the infusion of zanier plots has created diminishing returns in terms of quality.
See also: diminish, return

the law of diminishing returns

used to refer to the point at which the level of profits or benefits to be gained is reduced to less than the amount of money or energy invested.
This expression originated in the early 19th century with reference to the profits from agriculture.
See also: diminish, law, of, return