QuestionAugust 10, 2025

13. Diminishing returns to an input set in: A) when all inputs are fixed. B) when some inputs are fixed and some are variable. C) when all inputs are variable. D) only in the long run.

13. Diminishing returns to an input set in: A) when all inputs are fixed. B) when some inputs are fixed and some are variable. C) when all inputs are variable. D) only in the long run.
13. Diminishing returns to an input set in:
A) when all inputs are fixed.
B) when some inputs are fixed and some are variable.
C) when all inputs are variable.
D) only in the long run.

Solution
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Answer

B) when some inputs are fixed and some are variable. Explanation 1. Define Diminishing Returns Diminishing returns occur when adding an additional factor of production results in a smaller increase in output. 2. Analyze Options A) Incorrect. All inputs fixed means no change in input levels. B) Correct. Some inputs fixed and some variable can lead to diminishing returns as more of the variable input is added. C) Incorrect. All inputs variable typically relates to returns to scale, not diminishing returns. D) Incorrect. Diminishing returns can occur in the short run when at least one input is fixed.

Explanation

1. Define Diminishing Returns<br /> Diminishing returns occur when adding an additional factor of production results in a smaller increase in output.<br /><br />2. Analyze Options<br /> A) Incorrect. All inputs fixed means no change in input levels.<br /> B) Correct. Some inputs fixed and some variable can lead to diminishing returns as more of the variable input is added.<br /> C) Incorrect. All inputs variable typically relates to returns to scale, not diminishing returns.<br /> D) Incorrect. Diminishing returns can occur in the short run when at least one input is fixed.
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