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Law of Diminishing Marginal Utility


The Law of Diminishing Marginal Utility is a fundamental economic principle stating that as a person consumes more of a specific good, the increase in satisfaction (marginal utility) obtained from each additional unit of that good decreases. In simpler terms, the more one consumes something, the less satisfaction they derive from each new unit consumed. This concept helps explain the eventual decline in desire for a particular good or service.


In the International Phonetic Alphabet (IPA), the phonetics of the keyword “Law of Diminishing Marginal Utility” can be represented as:/lɔː əv dɪˈmɪnɪʃɪŋ ˈmɑːrʤɪnəl juːˈtɪlɪti/

Key Takeaways

  1. The Law of Diminishing Marginal Utility states that as a person consumes more units of a specific good or service, the satisfaction or utility they derive from each additional unit will eventually decrease. This means that the more we consume something, the less value or satisfaction we gain from it.
  2. This concept plays a crucial role in understanding consumer behavior, as it helps explain why people may be willing to purchase goods or services at higher prices when they consume less, but require a decrease in price to continue consuming additional units in order to feel the same level of satisfaction.
  3. The Law of Diminishing Marginal Utility is also significant in determining the optimal consumption pattern for an individual, as it implies that consumers will allocate their income in a way that maximizes total utility, often by diversifying their consumption of different goods and services to achieve a balance of satisfaction from each level of consumption.


The Law of Diminishing Marginal Utility is important in business and finance because it reflects the psychological tendency of consumers to experience diminishing satisfaction with each successive unit of a good or service consumed. This fundamental principle influences consumer behavior, pricing strategies, and resource allocation in markets. By understanding this concept, businesses can make informed decisions regarding optimal production levels, pricing to maximize profits, and creating product variations or marketing strategies to keep consumers engaged. Simultaneously, it also helps finance professionals to assess the most efficient allocation of resources to achieve an optimal risk-reward balance in investments and comprehend consumer spending patterns, which in turn impacts the overall economic landscape.


The Law of Diminishing Marginal Utility is a fundamental concept in the realm of microeconomics, serving as a key tool for understanding consumer behavior and decision-making. Its primary purpose is to showcase the relationship between the consumption of a good or service and the satisfaction that it yields. The law posits that as an individual continues to consume additional units of a specific good or service, the satisfaction gained from each extra unit – referred to as marginal utility – gradually decreases. This decrease in marginal utility occurs because the individual’s wants and needs are progressively satisfied, making each subsequent consumption less gratifying than the previous one. This principle effectively guides the allocation of resources, as it influences the consumer’s decision of whether to purchase more of a particular product or to explore available alternatives in the market in search of higher utility. The Law of Diminishing Marginal Utility also plays a crucial role in the development of pricing strategies, demand analysis, and public policies based on utility maximization. For instance, it can help firms to determine the ideal price point that would maximize their revenue, factoring in the diminishing satisfaction that consumers experience as they consume additional quantities of goods or services. In considering public policies, government agencies can leverage this concept to design welfare programs, tax systems, and income redistribution policies that cater to the diverse needs of the society, while taking into account that consumers have different utility levels for various goods and services. Furthermore, the law also has implications for the consumer’s choice concerning limited resources and budget constraints, as it aids in identifying the optimal consumption pattern that would lead to the highest overall satisfaction.


The Law of Diminishing Marginal Utility states that as a person consumes more units of a particular good or service, the additional satisfaction or utility derived from each successive unit decreases. Here are three real-world examples: 1. Food consumption: Imagine you are at an all-you-can-eat buffet, and you are starving. As you eat your first plate of food, your satisfaction and utility from eating is very high. However, as you consume more plates of food, your satisfaction from each additional plate decreases. By the time you are on your fourth or fifth plate, you may feel neutral or negative satisfaction due to being overly full. 2. Smartphone features: When smartphones were first introduced, their features such as internet access, high-quality cameras, and app capabilities provided high utility to users. However, as manufacturers continue to add more features, the additional utility from each new feature decreases. For instance, upgrading from a 12MP camera to a 16MP camera might not provide the same level of satisfaction as upgrading from no camera to a 12MP camera. 3. Watching a TV series: When you begin watching a new TV series that you enjoy, the first few episodes may provide high levels of satisfaction and enjoyment. However, as you continue to binge-watch the series, your satisfaction from each subsequent episode may decrease. This could be due to factors such as over-saturation, repetitiveness, or simply getting tired of watching the show.

Frequently Asked Questions(FAQ)

What is the Law of Diminishing Marginal Utility?
The Law of Diminishing Marginal Utility is an economic principle that states that as an individual consumes more of a good or service, the perceived satisfaction or utility they derive from each additional unit declines.
Why is the Law of Diminishing Marginal Utility important in finance and economics?
This law plays a crucial role in understanding consumer behavior and demand. It helps explain why demand curves are typically downward sloping – as more units of a good are consumed, the marginal utility decreases, resulting in a lower willingness to pay for additional units.
How does the Law of Diminishing Marginal Utility relate to consumer decision-making?
Consumers will make choices based on the expected utility they derive from goods and services. As the marginal utility decreases for a specific good, consumers become less willing to replace it with an additional unit, especially if the price remains constant or increases.
Can the Law of Diminishing Marginal Utility be applied to all goods and services?
The law generally applies to most goods and services; however, there can be exceptions in unique situations. For instance, some luxury items might hold an increasing marginal utility for certain consumers or specific life-saving medicines’ utility could continue to rise with each additional dose.
Does the Law of Diminishing Marginal Utility apply to negative experiences, too?
Yes, the law can also apply to negative experiences or dis-utilities. For example, pollution could be considered a negative experience, and with each additional unit of pollution, the marginal dis-utility may decrease.
What are some real-life examples of the Law of Diminishing Marginal Utility?
One typical example is the consumption of food. When hungry, the first bite of a meal brings a high level of satisfaction. However, as a person continues to eat, each additional bite becomes less enjoyable, and eventually, the person will feel too full to eat anymore.
How does the concept of marginal utility affect pricing strategies?
Businesses can use the Law of Diminishing Marginal Utility to develop pricing strategies that maximize profit. They may offer volume discounts to encourage consumers to make larger purchases, knowing that the customer’s willingness to pay may decline for additional units.

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