When all other inputs remain fixed except one, and increasing that variable input causes its marginal product to decline gradually, what principle does this illustrate?

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Declining returns to scaleThe principle of diminishing returnsConstant returns to scaleAn ineffective production methodIncreasing returns to scale

Explanation

The scenario describes the law of diminishing returns, which states that as more units of a variable input are added to fixed inputs, the additional output produced by each new unit eventually decreases.