When too much of an input is used, and output decreases, the production process results in:

Correct option is D

Correct Answer: (D) Negative returns

Explanation:

• This situation is explained under the Law of Variable Proportions (Law of Diminishing Returns).
• When too much of a variable input (like labour) is added to fixed inputs (like land), the production process eventually reaches a stage where Total Physical Product (TPP) starts to decline.
• This happens because the Marginal Product (MP) becomes negative, meaning each additional unit of input reduces total output.
• Therefore, when output actually decreases due to excessive input use, it is termed as Negative Returns (Stage III of production).

Information Booster:

• Phase I: Increasing Returns – MP rises, TPP increases at an increasing rate.
• Phase II: Diminishing Returns – MP falls but remains positive, TPP increases at a decreasing rate.
• Phase III: Negative Returns – MP becomes negative, TPP decreases.

Additional Knowledge:

• Constant returns (Option A): Output increases proportionately with inputs.
• Increasing returns (Option B): Output increases more than proportionately.
• Decreasing returns (Option C): Output still increases, but at a decreasing rate (does not decline).