Short Answer

Diminishing returns occur in the short run because some factors of production remain fixed while only one factor is increased. When more units of a variable factor like labor are added to fixed resources, efficiency starts falling after a certain point.

In simple words, when too many workers use limited machines or land, productivity decreases. This leads to smaller increases in output, which is known as diminishing returns.

Detailed Explanation:

Meaning of Diminishing Returns in Short Run

Diminishing returns in the short run refers to a situation where the addition of more units of a variable factor, while keeping other factors fixed, leads to a decrease in the extra output produced. In the short run, at least one factor of production such as land or capital cannot be changed.

At the beginning of production, increasing the variable factor improves efficiency. For example, adding more workers helps in better use of machines and increases output quickly. But after some time, the fixed resources become limited, and they cannot support additional workers effectively.

As a result, the productivity of each additional worker starts to decrease. This is the stage where diminishing returns begin. It is a natural situation in production because fixed factors create limitations.

Causes of Diminishing Returns in Short Run

Limited fixed factors
In the short run, some resources like land, machines, or factory space remain fixed. When more workers are added, they have to share these limited resources. This reduces efficiency and leads to lower additional output.

Overcrowding of resources
When too many workers are employed with limited machines or space, overcrowding occurs. Workers may interfere with each other’s work, which reduces productivity.

Overuse of fixed resources
Fixed resources have limited capacity. When they are used beyond their limit, they cannot support additional workers properly. This leads to a fall in output per worker.

Lack of coordination
As the number of workers increases, managing them becomes difficult. Poor coordination can lead to confusion, delays, and wastage of time, which reduces efficiency.

Imperfect combination of factors
Production requires a proper balance between factors. Increasing only one factor, like labor, without increasing others like capital, creates imbalance and reduces productivity.

Law of variable proportions
This law explains that when one factor is increased while others are fixed, output first increases, then increases at a decreasing rate, and finally may decrease. This is the main reason behind diminishing returns.

Conclusion

Diminishing returns in the short run occur because of fixed factors, overcrowding, and imbalance in production. When more variable inputs are added to limited resources, efficiency decreases. Understanding this concept helps firms use resources properly, avoid wastage, and improve production decisions.