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Q: The relationship between variable input and output, keeping all other inputs constant is called ________.
  • A. marginal product
  • B. law of diminishing marginal product
  • C. law of variable proportions
  • D. total product of variable input
Correct Answer: Option D - If we vary a single input and keep another input constant, then for different levels of employment at that input, we get different levels of output from the production function. This relationship between the variable input and output, keeping all other input constant, is often referred to as total product (TP) of the variable input.
D. If we vary a single input and keep another input constant, then for different levels of employment at that input, we get different levels of output from the production function. This relationship between the variable input and output, keeping all other input constant, is often referred to as total product (TP) of the variable input.

Explanations:

If we vary a single input and keep another input constant, then for different levels of employment at that input, we get different levels of output from the production function. This relationship between the variable input and output, keeping all other input constant, is often referred to as total product (TP) of the variable input.