GCEAgricultural ScienceAgricultural Economics2019

The law of diminishing returns in agriculture states that as more units of a variable input are added to fixed inputs,

Atotal output will always decrease
Bthe marginal product of the variable input will eventually declineCORRECT
Cfixed costs will increase proportionately
Dthe price of the produce will rise continuously
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Why the answer is B, and why the others tempt you.
The law of diminishing returns states that when successive units of a variable input (e.g., labour or fertilizer) are added to a fixed input (e.g., land), the additional output (marginal product) from each successive unit will eventually decrease. It does not mean total output falls immediately, but that the rate of increase slows down.
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