Demerit good

Ineconomics,ademerit goodis "agoodorservicewhose consumption is considered unhealthy, degrading, or otherwise socially undesirable due to the perceived negative effects on the consumers themselves ";it could be over-consumed if left to market forces ofsupply and demand.Examples of demerit goods includetobacco,alcoholic beverages,recreational drugs,gamblingandjunk food.Because of the nature of these goods,governmentsoften levytaxeson these goods (specifically,sin taxes), in some cases regulating or banning consumption or advertisement of these goods.

Concept

There is an important conceptual distinction between a demerit good and anegative externality.A negative externality occurs when the consumption of a good has measurable negative consequences on others who do not consume the good themselves.Pollution (due, for example, to automobile use) is the canonical example of a negative externality. By contrast, a demerit good is considered as undesirable because its consumption has negative effects upon the consumer.Cigaretteshave both properties: they are a demerit good because they damage the smoker's own health and also produce the negative externality of damage to others bysecond-hand smoke.

Two fundamental opinions ofwelfare economics,welfarismandpaternalism,differ in their conceptual treatment of "demerit goods". Simply, welfarism considers the individual'sownperception of the utility of a good as the final judgement of the utility of the good for that person, and thereby disallows the concept of a 'demerit good' (while allowing the analysis of negative externalities). As an extreme example, if aheroin addictpurchases heroin, they must have done so because heroin makes them better somehow, and this transaction is considered therefore as a net social positive (assuming that the addict does not commit any other crimes as the result of their addiction). Paternalism judges that heroin "isn't good for you", and feels free to override the judgement of the addicts themselves.

See also

• Pigovian tax
• Soda tax
• Taxation and regulation of alcohol production
• Alcohol tax
• Tobacco tax

Further reading

• Boadway; Bruce (1984).Welfare Economics.Basil Blackwell.ISBN9780631133278.