Which of the following is not true?

The production function of a firm is a monetary relationship between inputs used and output produced by the firm.

The correct answer is Option (1) → The production function of a firm is a monetary relationship between inputs used and output produced by the firm.

(A) The production function of a firm is a monetary relationship between inputs used and output produced by the firm. This is not true. The production function shows a technical or physical relationship between inputs and output, not a monetary one. It tells how much quantity of output can be produced from given quantities of inputs like labour and capital, assuming efficient use. It deals with physical quantities, not money values.

(B) The production function gives the maximum quantity of output that can be produced. This is true. The production function represents the maximum possible output that can be achieved from a given combination of inputs when they are used efficiently. It shows the upper limit of production capacity with existing resources.

(C) A production function deals only with the efficient use of inputs. This is true. The production function assumes that inputs are used in the best possible way, with no wastage. Inefficient use of inputs would result in less output than what the production function indicates.

(D) A production function is defined for a given technology. This is true. The production function depends on the existing state of technology. If technology improves, more output can be produced from the same inputs, and the production function will change.