What happens to the quantity of a good sold when sellers are taxed per unit sold?

When sellers are taxed per unit sold, it increases the cost of selling the good. This tax effectively shifts the supply curve upward because sellers need to charge a higher price to cover this additional cost. As a result, the equilibrium price in the market rises, leading to a decrease in the quantity demanded by consumers.

In a typical scenario dictated by the law of demand, when the price of a good increases, the quantity demanded decreases. Consequently, as the new equilibrium price is established, it leads to a situation where a smaller quantity of the good is sold compared to what would have been sold without the tax. This is why the correct answer indicates that a smaller quantity of the good is sold following the implementation of a per-unit tax on sellers.