When the supply curve for a product has infinite elasticity and and excise tax is levied on the product then it increase the price the consumer pays per unit by the amount of the tax.
The extreme situation when either the quantity demanded (Qd) or supplied (Qs) varies by an unlimited amount in response to any change in price at all is known as infinite elasticity or perfect elasticity.
Any duty on manufactured goods that is assessed at the time of manufacture rather than the time of sale is known as an excise, or excise tax.
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