Harber's triangle

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Harber's triangle - Harber's triangle is called the irreversible social loss caused by the introduction of a tax. Harber's triangle took its name from the name of an economist who examined the subject.

The loss caused by the introduction of a tax on goods can be expressed in terms of reducing the surplus of the consumer. The figure above shows the consumer surplus before and after the introduction of a perfectly competitive AD tax, which is wholly transferred to the final price of the good. Simple d is a compensated curve of demand for a given good. Before the introduction of the tax the point of equilibrium was point B. Its introduction at AD shifts the supply curve up by a value equal to the amount of tax, and the new point of equilibrium becomes E. The surplus of the consumer thus decreases with ABED. Part of this loss (AGED) could be a source of increased utility as a result of the allocation of these funds to finance state spending. The rest (EGB) called Harber's triangle is irreversible social loss. Bibliography

N. Acocella, Principles of economic policy, Wydawnictwo PWN, 2002

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