When more and more workers are applied on the fixed land then the marginal productivity of additional worker will .............. to the total output.

Fall

The correct answer is Option (4) → Fall

When more and more units of a variable factor (labour) are employed on a fixed factor (land), the marginal productivity of the additional workers eventually falls.

This happens due to the Law of Diminishing Marginal Returns, which states that: As more units of a variable factor are combined with a fixed factor, the additional output (marginal product) from each new unit of the variable factor will eventually decrease.

At first, total output rises at an increasing rate, then at a decreasing rate, and finally may even decline.