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Economics glossary · When markets fail

Demerit good

What demerit good means in economics, with an example and a question to test yourself.

Definition
Demerit good
A demerit good is a good that a free market over-consumes, because buyers underestimate its harm to themselves or ignore its cost to others.
Not to be confused with: Merit good
A merit good is a good that a free market under-consumes, because buyers underestimate its benefit to themselves or ignore its benefit to others.
Test yourself

What is the difference between demerit good and merit good?

Learn it properly: the module

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