Balanced budget multiplier refers to the changes in production
due to the government imposed taxes and purchases.
It is actually the sum of expenditure multiplier and the tax
multiplier or the ratio of the change in GDP to a change in
government spending which is equal to the change in taxes.
The balanced budget multiplier is always equal to one as the
multiplier effect caused by the changes in taxes offsets everything
excluding the purchase of aggregate production made by the initial
injection.