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What is the Law of Diminishing Marginal Utility?
Grade Level:
Class 9
Law, Civic Literacy, Economics, FinTech, Geopolitics, Personal Finance, Indian Governance
Definition
What is it?
The Law of Diminishing Marginal Utility states that as a person consumes more and more units of a specific good or service, the additional satisfaction (utility) they get from each extra unit tends to decrease. Simply put, the more you have of something, the less excited you get about having one more unit of it.
Simple Example
Quick Example
Imagine you are very hungry after school and your mom offers you your favorite samosas. The first samosa tastes amazing and gives you immense satisfaction. The second one is also very good, but perhaps slightly less satisfying than the first. By the time you eat the fourth or fifth samosa, you might feel full, and any additional samosa would give you very little, or even negative, satisfaction.
Worked Example
Step-by-Step
Let's say you are playing a mobile game and earning 'coins'.
Step 1: You have 0 coins. Earning the 1st coin gives you 10 points of happiness (utility).
--- Step 2: You now have 1 coin. Earning the 2nd coin gives you 8 points of happiness.
--- Step 3: You now have 2 coins. Earning the 3rd coin gives you 5 points of happiness.
--- Step 4: You now have 3 coins. Earning the 4th coin gives you 2 points of happiness.
--- Step 5: You now have 4 coins. Earning the 5th coin gives you 0 points of happiness.
--- Step 6: If you earned a 6th coin, it might even make you feel bad (negative utility) because you have too many and they are now useless.
Answer: Here, the marginal utility (additional happiness) from each extra coin is decreasing (10, 8, 5, 2, 0), showing the Law of Diminishing Marginal Utility.
Why It Matters
Understanding this law helps businesses decide how much to produce and how to price their products, ensuring they don't flood the market with too much of one item. It's crucial for economists who study consumer behavior and for marketing professionals designing sales strategies. This concept also influences personal finance decisions, helping you understand why buying endless identical items might not bring more happiness.
Common Mistakes
MISTAKE: Thinking that total satisfaction decreases with each additional unit. | CORRECTION: Total satisfaction usually increases, but at a slower rate. It's the *additional* satisfaction (marginal utility) that decreases, not the total.
MISTAKE: Believing this law applies only to physical goods. | CORRECTION: This law applies to almost anything, including services, experiences, or even abstract things like knowledge or information.
MISTAKE: Confusing diminishing marginal utility with diminishing returns in production. | CORRECTION: Diminishing marginal utility is about consumer satisfaction from consuming successive units, while diminishing returns is about the output from adding more inputs in production.
Practice Questions
Try It Yourself
QUESTION: If the first slice of pizza gives you 20 units of satisfaction and the second slice gives you 15 units, what is happening to your marginal utility? | ANSWER: Your marginal utility is diminishing.
QUESTION: A student gets 10 marks for solving the first math problem, 8 marks for the second, and 5 marks for the third. Is the Law of Diminishing Marginal Utility applicable here? Explain. | ANSWER: Yes, it is applicable. The 'utility' (satisfaction or marks in this case) from each additional problem solved is decreasing, demonstrating diminishing marginal utility.
QUESTION: You are buying mobile data packs. The first 1GB pack costs Rs. 100 and you use it completely. A second 1GB pack also costs Rs. 100, but you only use half of it. A third 1GB pack also costs Rs. 100, but you barely use any. How does this scenario relate to the Law of Diminishing Marginal Utility? | ANSWER: This scenario perfectly illustrates the Law of Diminishing Marginal Utility. Your 'utility' or need for additional data decreases with each subsequent purchase, even if the price remains the same. You get less value (satisfaction from usage) from the second and third packs because your immediate need for data is reducing after the first pack.
MCQ
Quick Quiz
What happens to the additional satisfaction you get from consuming more and more units of the same good?
It increases rapidly.
It remains constant.
It tends to decrease.
It first decreases, then increases.
The Correct Answer Is:
C
The Law of Diminishing Marginal Utility states that the additional satisfaction (marginal utility) from consuming each extra unit of a good tends to decrease, not increase or remain constant. It doesn't typically reverse and increase after decreasing.
Real World Connection
In the Real World
This law helps companies like Zomato or Swiggy understand customer behavior. While a customer might enjoy ordering food frequently, offering unlimited discounts for every single order might not increase their satisfaction or loyalty proportionally after a certain point. Instead, they might offer varied deals or loyalty programs to keep the 'marginal utility' of their service high.
Key Vocabulary
Key Terms
UTILITY: The satisfaction or happiness a person gets from consuming a good or service. | MARGINAL: Referring to an additional unit or the change from one more unit. | CONSUMPTION: The act of using goods and services to satisfy needs and wants. | SATISFACTION: The fulfillment of one's wishes, expectations, or needs, or the pleasure derived from this.
What's Next
What to Learn Next
Now that you understand diminishing marginal utility, you can explore the concept of 'Consumer Equilibrium'. This will show you how consumers make choices to maximize their total satisfaction given their budget, using the principles you've just learned.
