Exceptions to law of diminishing marginal utility include

🔑Key Points:
Marginal utility – It is the additional utility derived from the consumption of an additional unit of a commodity. Marginal utility is also known as Marginal Satiety.
MU = Change in TU/Change in Quantity
MU= TUn – TUn-1 
Also, Marginal Utility is the additional utility made to be TU by the addition consumption of one more unit of a commodity.

🛑Important Points:
Law of diminishing marginal utility – 
According to the Law of Diminishing Marginal Utility, the additional utility derived from increasing consumption declines with each additional increase in consumption level. 
It enables us to comprehend why consumers are becoming less and less satisfied with each new good unit.
The ordinal utility theory serves as the foundation for the law, which is subject to certain presumptions.
Exceptions to the law of diminishing marginal utility – 
Hobbies/Addictions – In the case of addictions, this law is not applicable. For an alcoholic, the marginal benefit of consuming one more drink does not diminish. Similar to this, someone who enjoys painting would not encounter diminishing marginal utility when creating a new work of art.
Rare Items – Additionally, it is not applicable to rare things. It is particularly true for enthusiasts who pursue and are passionate about such topics. For instance, a watch collector who already owns a lot of watches would find considerably greater satisfaction in purchasing a limited-edition timepiece.
Unrealistic Assumptions – This legislation makes assumptions that sometimes do not hold true. Occasionally, a customer could make an irrational choice.