Why does a business often reach a point at which adding more resources does not increase productivity or profits at the same rate it used to? (diminishing returns, stages of production)

diminishing returns,

Explanation:

The law of diminishing marginal returns claims that the returns from the input will first increase at an increasing rate until production reaches an optimal level. After the optimal level, and holding the other factors constant, the returns from the output will start diminishing and eventually turn negative.

Diminishing returns concepts apply in the short term, where only variable inputs can change. For example, in a factory setting, the optimal production capacity is fixed in the short-run. Additional usage of a variable such as labor increase returns until the factor reaches its optimal capital. Additional hiring of labor results in diminishing returns in labor output.

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