Short Answer

Marginal product eventually declines because one factor of production is increased while other factors remain fixed. As more units of the variable factor are added, the fixed factors become limited, reducing efficiency.

In simple words, when too much of one input is used with limited resources, productivity falls. This leads to a decrease in the additional output produced by each new unit of input.

Detailed Explanation:

Marginal Product Decline

Meaning of Marginal Product

Marginal product refers to the additional output produced by adding one more unit of a variable factor, such as labor, while keeping other factors constant.

At first, marginal product increases due to better use of fixed resources. However, after a certain point, it starts to decline. This decline is explained by the Law of Variable Proportions.

Understanding marginal product is important because it helps firms decide how much input to use for efficient production.

Fixed Factors Become Limited

One of the main reasons for the decline in marginal product is the limited availability of fixed factors. In the short run, factors like land, machinery, and buildings cannot be increased.

When more units of the variable factor are added, these fixed factors become insufficient. For example, too many workers using the same machine may reduce efficiency.

This imbalance between variable and fixed factors leads to a fall in marginal product.

Overcrowding of Resources

As more variable inputs are added, overcrowding occurs. Workers may interfere with each other’s work, causing delays and confusion.

This reduces the efficiency of each additional unit of input. As a result, the extra output produced by each new unit starts to decrease.

Overcrowding is a common reason for declining marginal product in production.

Decrease in Efficiency

In the beginning, workers may perform efficiently due to proper use of resources. But after some time, efficiency starts to fall.

This happens because fixed resources cannot support the increasing number of workers. Coordination becomes difficult, and productivity decreases.

Lower efficiency leads to a decline in marginal product.

Law of Variable Proportions

The decline in marginal product is explained by the Law of Variable Proportions. According to this law, when more units of a variable factor are added to fixed factors, output first increases and then increases at a decreasing rate.

The decreasing rate of increase in output means that marginal product is declining. This is a natural outcome of the production process in the short run.

Imbalance of Factors

Efficient production requires a proper balance between all factors of production. When this balance is disturbed by increasing only one factor, productivity declines.

For example, increasing labor without increasing machines creates imbalance. This reduces the effectiveness of each worker and lowers marginal product.

Practical Example

For example, in farming, land is fixed, and labor is variable. Initially, adding workers increases crop production. But after a certain point, adding more workers leads to overcrowding.

Each additional worker contributes less to output than before, causing marginal product to decline.

Importance of Understanding

Understanding why marginal product declines helps firms avoid overuse of inputs. It guides them to use resources efficiently and maintain productivity.

It also helps in cost control and better planning of production.

Conclusion

Marginal product eventually declines due to limited fixed factors, overcrowding, and imbalance of resources. As more variable input is added, efficiency decreases, leading to lower additional output. Understanding this concept helps firms make better production decisions and maintain efficiency.