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110/14/2016
Utility is a measure of
satisfaction, referring to the
total satisfaction received by a
consumer from consuming a
good or service
Utility measures the want-
satisfying power of a good or
service(usefulness)
Introduction
210/14/2016
Marginality
The term marginal refers to a small
change, starting from some baseline level.
Marginal utility is the additional or
incremental satisfaction (utility) a
consumer receives from acquiring one
additional unit of a product.
3
10/14/2016
Marginal utility =
The addition made to the total
utility by the
addition of consumption of one
Or more unit of a commodity.
410/14/2016
The law of diminishing marginal utility states that
‘as a consumer consumes more and more
units of a specific commodity,
utility from the successive units
goes on diminishing’.
• Mr. H. Gossen, a German economist, was the first to
explain this Law in 1854.
• Alfred Marshall later on restated this Law as follows:
“The additional benefit which a person derives from an
increase of his stock of a thing diminishes with every
increase in the stock that he already has”.
Definition
of Law of Diminishing Marginal Utility5
10/14/2016
Law based upon three facts:
The law of diminishing utility is based upon three facts.
• Firstly
The wants of a man are unlimited but single want can be
satisfied. As a man gets more and more units of a commodity,
the desire of his want for that good goes on falling. A point is
reached when the consumer no longer wants any more units of
that good,
• Secondly
Different goods are not perfect substitutes for each other in the
satisfaction of various particular wants.
• Thirdly
There is no change in the tastes of the consumers.
610/14/2016
• Explanation and Example
of Law of Diminishing
Marginal Utility:
• Suppose, a man is very thirsty. He
goes to the market and buys one
glass of sweet water. The glass of
water gives him immense pleasure
or we say the first glass of water
has great utility for him.
• If he takes second glass of water
after that, the utility will be less
than that of the first one
• If he drinks 3rd glass of water the
utility declines again and so on…. 710/14/2016
Units Total Utility Marginal Utility
1st glass 20 20
2nd glass 32 12
3rd glass 40 8
4th glass 42 2
5th glass 42 0
6th glass 39 -3
Schedule of Law of Diminishing Marginal
Utility
From the above table, it is clear that in a given span of time, the
first glass of water to a thirsty man gives 20 units of utility.
When he takes second glass of water, the marginal utility goes
on down to 12 units; When he consumes fifth glass of water, the
marginal utility drops down to zero and if the consumption of
water is forced further from this point, the utility changes into
disutility (-3). 810/14/2016
Curve/Diagram
of Law of Diminishing Marginal Utility:
In the figure (2.2), along OX we measure units of a commodity consumed and along OY is
shown the marginal utility derived from them. The marginal utility of the first glass of water
is called initial utility. It is equal to 20 units. The MU of the 5th glass of water is zero. It is
called satiety point. The MU of the 6th glass of water is negative (-3). The MU curve here
lies below the OX axis. The utility curve MM/ falls left from left down to the right showing
that the marginal utility of the success units of glasses of water is falling.
9
10/14/2016
1010/14/2016
Law of Diminishing MU
Notes about the Law of Diminishing MU
• Time period must be specified for law.
• Law tells us that eventually the marginal
utility curve will be downward sloping.
• Law tells us that eventually the total utility
curve will become “flatter.”
• Slope of the total utility curve is equal to
marginal utility
1110/14/2016
Assumptions
of Law of Diminishing Marginal Utility
• The law is true under certain assumptions as follows:
• (i) Rationality: The consumer aims at maximization of
utility subject to availability of his income.
• (ii) Constant marginal utility of money: The marginal utility
of money based for purchasing goods remains constant.
• (iii) Diminishing marginal utility: The utility gained from
the successive units of a commodity diminishes in a given
time period.
• (iv)Utility is additive: The utilities of different commodities
are independent.
1210/14/2016
• (v) Consumption to be
continuous
• (vi) Suitable Reasonable
quantity: If the units are too
small, then the marginal
utility instead of falling may
increase up to a few units.
• (vii) Character of the
consumer does not change.
• (viii) No change to fashion,
Customs and Tastes.
• (ix) No change in the price of
the commodity.
1310/14/2016
Law of Diminishing Marginal Utility
Though wants of an individual are unlimited in number yet each
individual want is satiable. Because of this, the more we have a
commodity, the less we want to have more of it.
This law state that as the amount consumed of a commodity
increases, the utility derived by the consumer from the
additional units, i.e marginal utility goes on decreasing.
According to Marshall, “The additional benefit a person derives from
a given increase of his stock of a thing diminishes with every
increase in the stock that he already has”
1410/14/2016
Limitations/Exceptions
of Law of Diminishing Marginal Utility
(i) Case of intoxicants: The more a person drinks
liquor, the more s/he likes it.
(ii) Rare collection: If there are only two diamonds
in the world, the possession of 2nd diamond will
push up the marginal utility.
(iii) Application to money: It is true that more
money the man has, the greedily he is to get
additional units of it. However, the truth is that
the marginal utility of money declines with
richness but never falls to zero.
1510/14/2016
conclusion
1610/14/2016
1710/14/2016

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Law of diminishing marginal utility

  • 2. Utility is a measure of satisfaction, referring to the total satisfaction received by a consumer from consuming a good or service Utility measures the want- satisfying power of a good or service(usefulness) Introduction 210/14/2016
  • 3. Marginality The term marginal refers to a small change, starting from some baseline level. Marginal utility is the additional or incremental satisfaction (utility) a consumer receives from acquiring one additional unit of a product. 3 10/14/2016
  • 4. Marginal utility = The addition made to the total utility by the addition of consumption of one Or more unit of a commodity. 410/14/2016
  • 5. The law of diminishing marginal utility states that ‘as a consumer consumes more and more units of a specific commodity, utility from the successive units goes on diminishing’. • Mr. H. Gossen, a German economist, was the first to explain this Law in 1854. • Alfred Marshall later on restated this Law as follows: “The additional benefit which a person derives from an increase of his stock of a thing diminishes with every increase in the stock that he already has”. Definition of Law of Diminishing Marginal Utility5 10/14/2016
  • 6. Law based upon three facts: The law of diminishing utility is based upon three facts. • Firstly The wants of a man are unlimited but single want can be satisfied. As a man gets more and more units of a commodity, the desire of his want for that good goes on falling. A point is reached when the consumer no longer wants any more units of that good, • Secondly Different goods are not perfect substitutes for each other in the satisfaction of various particular wants. • Thirdly There is no change in the tastes of the consumers. 610/14/2016
  • 7. • Explanation and Example of Law of Diminishing Marginal Utility: • Suppose, a man is very thirsty. He goes to the market and buys one glass of sweet water. The glass of water gives him immense pleasure or we say the first glass of water has great utility for him. • If he takes second glass of water after that, the utility will be less than that of the first one • If he drinks 3rd glass of water the utility declines again and so on…. 710/14/2016
  • 8. Units Total Utility Marginal Utility 1st glass 20 20 2nd glass 32 12 3rd glass 40 8 4th glass 42 2 5th glass 42 0 6th glass 39 -3 Schedule of Law of Diminishing Marginal Utility From the above table, it is clear that in a given span of time, the first glass of water to a thirsty man gives 20 units of utility. When he takes second glass of water, the marginal utility goes on down to 12 units; When he consumes fifth glass of water, the marginal utility drops down to zero and if the consumption of water is forced further from this point, the utility changes into disutility (-3). 810/14/2016
  • 9. Curve/Diagram of Law of Diminishing Marginal Utility: In the figure (2.2), along OX we measure units of a commodity consumed and along OY is shown the marginal utility derived from them. The marginal utility of the first glass of water is called initial utility. It is equal to 20 units. The MU of the 5th glass of water is zero. It is called satiety point. The MU of the 6th glass of water is negative (-3). The MU curve here lies below the OX axis. The utility curve MM/ falls left from left down to the right showing that the marginal utility of the success units of glasses of water is falling. 9 10/14/2016
  • 11. Law of Diminishing MU Notes about the Law of Diminishing MU • Time period must be specified for law. • Law tells us that eventually the marginal utility curve will be downward sloping. • Law tells us that eventually the total utility curve will become “flatter.” • Slope of the total utility curve is equal to marginal utility 1110/14/2016
  • 12. Assumptions of Law of Diminishing Marginal Utility • The law is true under certain assumptions as follows: • (i) Rationality: The consumer aims at maximization of utility subject to availability of his income. • (ii) Constant marginal utility of money: The marginal utility of money based for purchasing goods remains constant. • (iii) Diminishing marginal utility: The utility gained from the successive units of a commodity diminishes in a given time period. • (iv)Utility is additive: The utilities of different commodities are independent. 1210/14/2016
  • 13. • (v) Consumption to be continuous • (vi) Suitable Reasonable quantity: If the units are too small, then the marginal utility instead of falling may increase up to a few units. • (vii) Character of the consumer does not change. • (viii) No change to fashion, Customs and Tastes. • (ix) No change in the price of the commodity. 1310/14/2016
  • 14. Law of Diminishing Marginal Utility Though wants of an individual are unlimited in number yet each individual want is satiable. Because of this, the more we have a commodity, the less we want to have more of it. This law state that as the amount consumed of a commodity increases, the utility derived by the consumer from the additional units, i.e marginal utility goes on decreasing. According to Marshall, “The additional benefit a person derives from a given increase of his stock of a thing diminishes with every increase in the stock that he already has” 1410/14/2016
  • 15. Limitations/Exceptions of Law of Diminishing Marginal Utility (i) Case of intoxicants: The more a person drinks liquor, the more s/he likes it. (ii) Rare collection: If there are only two diamonds in the world, the possession of 2nd diamond will push up the marginal utility. (iii) Application to money: It is true that more money the man has, the greedily he is to get additional units of it. However, the truth is that the marginal utility of money declines with richness but never falls to zero. 1510/14/2016

Editor's Notes

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