The loss in total surplus resulting from a tax?

The loss in total surplus resulting from a tax is referred to as deadweight loss, which occurs because the tax distorts market behavior, leading to a decrease in the quantity of goods traded. This reduction in trade means that both consumer and producer surplus are lower than they would be in a tax-free market, resulting in a net loss of economic efficiency. Essentially, the tax creates a wedge between what consumers pay and what producers receive, leading to fewer transactions and a loss of potential gains from trade.