excise or sales tax specifically levied on goods deemed harmful to society and individuals (e.g. drugs, alcohol, tobacco, coffee, sugar, candies, soft drinks, fast food, gambling, pornography) From Wikipedia, the free encyclopedia
A sin tax is when the government taxes things that are considered to be bad for society.
For example, if the government increases taxes on alcohol and cigarettes, this will make them more expensive. In economics, if a normal good becomes more expensive, its consumption will drop.
Arthur Pigou was a famous economist who supported the sin tax.
Sin taxes also have problems:
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