Exceptions Of The Law Of Diminishing Marginal Utility

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There are various limitations / exceptions of the law of diminishing marginal utility. Major limitations are as follows:

1. Homogeneous Commodity
The law of diminishing marginal utility assumes that there should be single commodity with homogeneous units. All units of the commodity should be of the same same size and quality. If the units are not identical, this law will not be applied.

2. No change in tastes, habits, customs, fashion and income of the consumer
There should not be changed in tastes, habits, customs, fashion and income of the consumer. If the income of a consumer increases, the marginal utility of a certain goods will increase. In such case, increase in consumption may yield greater satisfaction or utility.

3. Continuity
There should be continuity in the consumption of the commodity; otherwise the law of diminishing marginal utility will not apply. Units of the commodity should be consumed in succession at one particular time. If the interval between the various units of consumption is too long, marginal utility may become higher..

4. Suitable size of units
Units of the commodity should be of a suitable size. It must not be too small. For example, giving water to a thirsty man by spoon will increase the utility of the successive spoon of water.

5. Ordinary commodities
Commodities should be of an ordinary types. If the commodities are likes diamonds and jewels or hobby commodities like stamps, coins or paintings, the law of diminishing marginal utility does not apply.

6. Marginal utility of money not constant
Our intensity for money increases as we have more of it. No doubt the marginal utility of money does not become zero, but it definitely falls as a person gets more and more money.The marginal utility of money for a rich is less than a poor man.

7. Rational consumer
The consumer should be an economic man, who acts rationally. This law does  not apply to persons of special nature such as drunkard, druggist etc. Marginal utility of wine for drunkard increases with every peg of drinks.

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