Law of Diminishing Returns: Marginal Product Impact

The Law of Diminishing Returns, a fundamental concept in production theory, describes the relationship between inputs and output.

Principle: When successive units of a single variable input (like labor) are added to a production process while keeping other inputs (like capital or land) fixed, the total output will initially increase at an increasing rate, then at a decreasing rate, and eventually, the additional output from each new unit of the variable input will start to fall.

This additional output generated by one more unit of the variable input is known as the marginal product.

Analysis of Options

• The law specifically addresses the change in output due to adding more of a variable factor. Options 1 and 2 relate to revenue (marginal revenue and average revenue), which are distinct concepts influenced by market conditions, not solely the production process described by this law.
• Option 4 suggests the marginal product will increase. This might happen initially as more variable factors are added, but the Law of Diminishing Returns states that beyond a certain point, this increase slows down and eventually turns into a decrease.
• Option 3 correctly identifies the core outcome of the Law of Diminishing Returns. After a certain point, as more variable inputs are employed with fixed inputs, the marginal product starts to diminish.

Therefore, according to the Law of Diminishing Returns, a point is reached where the marginal product will diminish.