Diminishing returns, also called law of diminishing returns or principle of diminishing marginal productivity, economic law stating that if one input in the production of a commodity is increased while all other inputs are held fixed, a point will eventually be reached at which additions of the input yield progressively smaller, or diminishing, increases in output.

The Law of Diminishing Returns is applicable in All Economic activities after a point.

Introduction:
The Law of Diminishing Returns is a concept in economics that states that as increasing amounts of a variable input are added to a fixed input, the marginal product of the variable input will eventually decline. In other words, after a certain point, adding more of a specific input will not result in a proportional increase of output and may even result in a decrease in productivity.

Applicability in all Economic Activities:
The Law of Diminishing Returns is not limited to any specific economic activity or industry. It is applicable to all economic activities, whether it is manufacturing, agriculture, or services. This law is based on the assumption that all factors of production except one remain constant, and the effect of varying the one factor is being examined.

Examples:
1. Manufacturing - In a factory, there may be a fixed number of machines and workers. Adding more workers without increasing the number of machines will lead to a point where the productivity of each worker will start to decline. This is an example of the law of diminishing returns.
2. Agriculture - In farming, the law of diminishing returns can be seen when adding more fertilizer to a fixed amount of land. Initially, adding fertilizer will increase the yield of crops, but after a certain point, adding more fertilizer will not result in a proportional increase in output and may even lead to a decrease in productivity.
3. Services - In the service industry, the law of diminishing returns can be observed when adding more employees to a fixed amount of work. Initially, adding employees will increase productivity, but after a certain point, adding more employees will not result in a proportional increase in output and may even lead to a decrease in productivity.

Conclusion:
In conclusion, the Law of Diminishing Returns is applicable in all economic activities after a certain point. It is an important concept in economics that helps businesses and policymakers understand the relationship between input and output and make informed decisions about resource allocation.

The law of diminishing marginal utility is a law of economics stating that as a person increases consumption of a product while keeping consumption of other products constant, there is a decline in the marginal utility that person derives from consuming each additional unit of that product.