Introduction
In its simplest terms: governments can raise money either through taxes or by issuing bonds. Since bonds are loans, they must eventually be repaid—presumably by raising taxes in the future. The choice is therefore "tax now or tax later."
Suppose that the government finances some extra spending through deficits; i.e. it chooses to tax later. This action might suggest to taxpayers that they will have to pay higher tax in future. Taxpayers would put aside savings to pay the future tax rise; i.e. they would willingly buy the bonds issued by the government, and would reduce their current consumption to do so. The effect on aggregate demand would be the same as if the government had chosen to tax now.
David Ricardo was the first to propose this possibility in the early nineteenth century; however, he was unconvinced of it. Antonio De Viti De Marco elaborated on Ricardian equivalence starting in the 1890s. Robert J. Barro took the question up independently in the 1970s, in an attempt to give the proposition a firm theoretical foundation. The proposition remains controversial.
Read more about this topic: Ricardian Equivalence
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