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Law of Equi Marginal Utility
According to this, a consumer is in equilibrium when he distributes his given money income among various
goods in such a way that marginal utility derived from the last rupee spent on each good is the same.

Assumptions

The main assumptions of the law of equi-marginal utility are as under:

 (1) Independent utilities. The marginal utilities of different commodities are independent of each other
and diminishes with more and more purchases.

(2) Constant marginal utility of money. The marginal utility of money remains constant to the consumer as
he spends more and more of it on the purchases of goods.

(3)   Utility is cardinally measurable.

(4)   Every consumer is rational in the purchase of goods.

(5)   Limited money income. A consumer has limited amount of money income to spend.

Definition and expLanation of the law:

 The law of equi-marginal utility is simply an extension of the law of diminishing marginal utility to two or
more than two commodities. The law of equi-marginal, is known, by various names. It is named as the Law
of Substitution, the Law of Maximum Satisfaction, the Law of Indifference, the Proportionate Rule and the
Gossen’s Second Law.

every consumer has unlimited wants. However, the income at his disposal at any time is limited. The
consumer is therefore, faced with a choice among many commodities that he can and would like to pay. He
therefore, consciously or unconsciously compares the satisfaction which he obtains from the purchase of the
commodity and the price which he pays for it. As he buys more and more of that comniodity, the utility of
the successive units begins to diminish. He stops further purchase of the commodity at a point where the
marginal utility of the commodity and its price are just equal. If he pushes the purchase further from his
point of equilibrium, then the marginal utility of the commodity will be less than that of price and the
household will be a loser. A consumer will be in equilibrium with a single commodity



                      Units of Money           MU of Tea             MU of Cigarettes
                             1                      10                      12
                             2                       8                      10
                             3                       6                       8
                             4                       4                       6
                             5                       2                       3
                           Rs.5              Total Utility = 30      Total Utility = 39


Handouts By: Sachin Pourush                                                                           Page 1
A rational consumer would like to get maximum satisfaction from Rs. 5.00. He can spend this money in
three ways.

(1)   Rs. 5.00 may be spent on tea only

(2)   Rs. 5.00 may be utilized for the purchase of cigarettes only.

(3)   Some rupees may be spent on the purchase of tea and some on the purchase of cigarettes.

 If the prudent consumer spends Rs. 5.00 on the purchase of tea, he gets 30 utility. If he spends Rs. 5.00 on
the purchase of cigarettes, the total utility derived is 39 which is higher than tea. In order to make the best of
the limited resources, he adjusts his expenditure.

(1)   By spending Rs. 4.00 on tea and Rs. 1.00 on cigarettes, he gets 40 utility (10+8+6+4+12=40).

(2)   By spending Rs. 3.00 oa tea and Rs. 2.00 on cigarettes, he derives 46 Utility (10+8+6+12+10=46).

(3)   By spending Rs. 2.00 on tea and Rs. 3.00 on cigarettes, he gets 48 utility (10+8+12+10+8=48).

(4)   By spending Rs. 1.00 on tea and Rs. 4.00 on cigarettes, he gets 46 utility (10+12+10+8+6=46).

 The sensible consumer will spend Rs. 2.00 on tea and Rs. 3.00 on cigarettes and will get the maximum
satisfaction. When he spends Rs. 2.00 on tea and Rs. 3.00 on cigarettes, the marginal utility derived from
both these commodities is equal to 8. When the marginal utilities of the two commodities are equalized, the
total utility is then maximum i.e., 48 as is clear from the schedule given above.

The law of equi-marginal utility can be explained with the help the diagrams.




Handouts By: Sachin Pourush                                                                                Page 2
In the diagram, MU is the marginal utility curve for tea and KL of cigarette. When a consumer spends OP
amount (Rs.2) on tea and OC (Rs.3) on cigarettes, the marginal utility derived from the consumption of both
the items (Tea and Cigarettes) is equal to 8 units (EP=NC). The consumer gets the maximum utility when he
        spends Rs. 2.00 on tea and Rs. 3.00 on cigarettes and by no other alteration in the expenditure.

 We now assume that the consumer spends Rs. 1.00 on tea (OC’ amount) and Rs. 4.00 (OQ’) on cigarettes.
If CQ’ more amount is spent on cigarettes, the added utility is equal to the area CQ’ N’N. On the other hand,
the expenditure on tea falls from OP amount (Rs.2) to OC’ amount (Rs. 1.00). There is a toss of utility equal
to the area C’PEE’. The loss in utility (tea) is greater than that of its gain in cigarettes. The consumer is not
deriving maximun satisfaction except the combination of expenditure of Rs. 2.00 on tea and Rs. 3.00 on
cigarettes.

Limitations of the Law

 (i) Effect of fashions and customs. The law of equi-marginal utility may become inoperative if people
forced by fashions and customs spend money on the purchase of those commodities which they clearly
know yield less utility but they cannot transfer the unit of money from the less advantageous uses to the
more advantageous uses because they are forced by the customs of the country.

(ii) Ignorance or Carelessness. Sometimes people due to their ignorance of price or carelessness to weigh
the utility of the purchased commodity do not obtain the maximum advantage by equating the marginal
utility in all the uses.

(iii) Indivisible Units. If the unit of expenditure is not divisible, then again the law may become inoperative.

(iv) Freedom to Choose. If there is no perfect freedom between various alternatives, the operation of law
may be impeded;

Importance of the law

The Law of equi-marginal utility is of great practical importance. The application of the principle of
substitution extends over almost every field of economic enquiry. Every consumer consciously or
unconsciously trying to get the maximum satisfaction from his limited resources acts upon this principle of
substitution. Same is the case with the producer. In the field of exchange and in theory of distribution too,
this law plays a vital role. In short, despite its limitation, the law of maximum satisfaction is meaningful
general statement of how consumers behave.

 In addition to its application to consumption, it applies equally to the theory of production and theory of
distribution. In the theory of production, it is applied on the substitution of various factors of production to
the point where marginal return from all the factors are equal. The government can also use this analysis for
evaluation of its different economic prices.

The equal marginal rule also guides an individual in the spending of his saving on different types of assets.
The law of equal marginal utility also guides an individual in the allocation of his time between work and
leisure. In short, despite limitations the law of substitution is applicable to all problems of allocation of
scarce resources.

Public finance: taxes are levied in such a manner that the marginal sacrifice of each tax payer is equal. Also
at the time of spending money, marginal benefit of each type of expenditure should be equal.

Handouts By: Sachin Pourush                                                                               Page 3

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Law of equimarginal utility

  • 1. Law of Equi Marginal Utility According to this, a consumer is in equilibrium when he distributes his given money income among various goods in such a way that marginal utility derived from the last rupee spent on each good is the same. Assumptions The main assumptions of the law of equi-marginal utility are as under: (1) Independent utilities. The marginal utilities of different commodities are independent of each other and diminishes with more and more purchases. (2) Constant marginal utility of money. The marginal utility of money remains constant to the consumer as he spends more and more of it on the purchases of goods. (3) Utility is cardinally measurable. (4) Every consumer is rational in the purchase of goods. (5) Limited money income. A consumer has limited amount of money income to spend. Definition and expLanation of the law: The law of equi-marginal utility is simply an extension of the law of diminishing marginal utility to two or more than two commodities. The law of equi-marginal, is known, by various names. It is named as the Law of Substitution, the Law of Maximum Satisfaction, the Law of Indifference, the Proportionate Rule and the Gossen’s Second Law. every consumer has unlimited wants. However, the income at his disposal at any time is limited. The consumer is therefore, faced with a choice among many commodities that he can and would like to pay. He therefore, consciously or unconsciously compares the satisfaction which he obtains from the purchase of the commodity and the price which he pays for it. As he buys more and more of that comniodity, the utility of the successive units begins to diminish. He stops further purchase of the commodity at a point where the marginal utility of the commodity and its price are just equal. If he pushes the purchase further from his point of equilibrium, then the marginal utility of the commodity will be less than that of price and the household will be a loser. A consumer will be in equilibrium with a single commodity Units of Money MU of Tea MU of Cigarettes 1 10 12 2 8 10 3 6 8 4 4 6 5 2 3 Rs.5 Total Utility = 30 Total Utility = 39 Handouts By: Sachin Pourush Page 1
  • 2. A rational consumer would like to get maximum satisfaction from Rs. 5.00. He can spend this money in three ways. (1) Rs. 5.00 may be spent on tea only (2) Rs. 5.00 may be utilized for the purchase of cigarettes only. (3) Some rupees may be spent on the purchase of tea and some on the purchase of cigarettes. If the prudent consumer spends Rs. 5.00 on the purchase of tea, he gets 30 utility. If he spends Rs. 5.00 on the purchase of cigarettes, the total utility derived is 39 which is higher than tea. In order to make the best of the limited resources, he adjusts his expenditure. (1) By spending Rs. 4.00 on tea and Rs. 1.00 on cigarettes, he gets 40 utility (10+8+6+4+12=40). (2) By spending Rs. 3.00 oa tea and Rs. 2.00 on cigarettes, he derives 46 Utility (10+8+6+12+10=46). (3) By spending Rs. 2.00 on tea and Rs. 3.00 on cigarettes, he gets 48 utility (10+8+12+10+8=48). (4) By spending Rs. 1.00 on tea and Rs. 4.00 on cigarettes, he gets 46 utility (10+12+10+8+6=46). The sensible consumer will spend Rs. 2.00 on tea and Rs. 3.00 on cigarettes and will get the maximum satisfaction. When he spends Rs. 2.00 on tea and Rs. 3.00 on cigarettes, the marginal utility derived from both these commodities is equal to 8. When the marginal utilities of the two commodities are equalized, the total utility is then maximum i.e., 48 as is clear from the schedule given above. The law of equi-marginal utility can be explained with the help the diagrams. Handouts By: Sachin Pourush Page 2
  • 3. In the diagram, MU is the marginal utility curve for tea and KL of cigarette. When a consumer spends OP amount (Rs.2) on tea and OC (Rs.3) on cigarettes, the marginal utility derived from the consumption of both the items (Tea and Cigarettes) is equal to 8 units (EP=NC). The consumer gets the maximum utility when he spends Rs. 2.00 on tea and Rs. 3.00 on cigarettes and by no other alteration in the expenditure. We now assume that the consumer spends Rs. 1.00 on tea (OC’ amount) and Rs. 4.00 (OQ’) on cigarettes. If CQ’ more amount is spent on cigarettes, the added utility is equal to the area CQ’ N’N. On the other hand, the expenditure on tea falls from OP amount (Rs.2) to OC’ amount (Rs. 1.00). There is a toss of utility equal to the area C’PEE’. The loss in utility (tea) is greater than that of its gain in cigarettes. The consumer is not deriving maximun satisfaction except the combination of expenditure of Rs. 2.00 on tea and Rs. 3.00 on cigarettes. Limitations of the Law (i) Effect of fashions and customs. The law of equi-marginal utility may become inoperative if people forced by fashions and customs spend money on the purchase of those commodities which they clearly know yield less utility but they cannot transfer the unit of money from the less advantageous uses to the more advantageous uses because they are forced by the customs of the country. (ii) Ignorance or Carelessness. Sometimes people due to their ignorance of price or carelessness to weigh the utility of the purchased commodity do not obtain the maximum advantage by equating the marginal utility in all the uses. (iii) Indivisible Units. If the unit of expenditure is not divisible, then again the law may become inoperative. (iv) Freedom to Choose. If there is no perfect freedom between various alternatives, the operation of law may be impeded; Importance of the law The Law of equi-marginal utility is of great practical importance. The application of the principle of substitution extends over almost every field of economic enquiry. Every consumer consciously or unconsciously trying to get the maximum satisfaction from his limited resources acts upon this principle of substitution. Same is the case with the producer. In the field of exchange and in theory of distribution too, this law plays a vital role. In short, despite its limitation, the law of maximum satisfaction is meaningful general statement of how consumers behave. In addition to its application to consumption, it applies equally to the theory of production and theory of distribution. In the theory of production, it is applied on the substitution of various factors of production to the point where marginal return from all the factors are equal. The government can also use this analysis for evaluation of its different economic prices. The equal marginal rule also guides an individual in the spending of his saving on different types of assets. The law of equal marginal utility also guides an individual in the allocation of his time between work and leisure. In short, despite limitations the law of substitution is applicable to all problems of allocation of scarce resources. Public finance: taxes are levied in such a manner that the marginal sacrifice of each tax payer is equal. Also at the time of spending money, marginal benefit of each type of expenditure should be equal. Handouts By: Sachin Pourush Page 3