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TAX MULTIPLIER: A measure of the change in aggregate production caused by changes in government taxes. The tax multiplier is the negative marginal propensity to consume times one minus the slope of the aggregate expenditures line. The simple tax multiplier includes ONLY induced consumption. More complex tax multipliers include other induced components. Two related multipliers are the expenditures multiplier, which measures the change in aggregate production caused by changes in an autonomous aggregate expenditure, and the balancedbudget multiplier which measures the change in aggregate production from equal changes in both taxes and government purchases. The tax multiplier measures the change in aggregate production triggered by an autonomous change in government taxes. This multiplier is useful in the analysis of fiscal policy changes in taxes. The tax multiplier differs from the expenditures multiplier based on how the autonomous change affects aggregate expenditures.The tax multiplier reflects the fact that a given autonomous change in taxes does NOT result in an equal change in aggregate expenditures. Taxes change disposable income, which causes changes in both consumption expenditures and saving. And only consumption expenditures affect aggregate expenditures. The expenditures multiplier, however, reflects the fact that a given autonomous change in an expenditure results in an equal change in aggregate expenditures. The tax multiplier is actually a family of multipliers that differ based on which components of the Keynesian model are assumed to be induced by aggregate production and income. The simple tax multiplier, as the name suggestions, is the simplest variation and includes only induced consumption. Every other component  investment expenditures, government purchases, taxes, exports, and imports  are assumed to be autonomous. More complex tax multipliers include different combinations of induced components, ranging all of the way up to the "complete" tax multiplier that realistically includes all induced components. Induced consumption, investment, and government purchases all increase the value of the expenditures multiplier. Induced taxes and imports both decrease the value of the expenditures multiplier. The Simple Tax MultiplierThe simple tax multiplier is the ratio of the change in aggregate production to an autonomous change in government taxes when consumption is the only induced expenditure. Autonomous tax changes trigger the multiplier process and induced consumption provides the cumulatively reinforcing interaction between consumption, aggregate production, factor payments, and income.The formula for this simple tax multiplier. (m[tax]), is: m[tax]  =   MPC  x  1 MPS  =   MPC MPS 
Where MPC is the marginal propensity to consume and MPS is the marginal propensity to save.This formula is almost identical to that for the simple expenditures multiplier. The only difference is the inclusion of the negative marginal propensity to consume ( MPC). If, for example, the MPC is 0.75 (and the MPS is 0.25), then an autonomous $1 trillion change in taxes results in an opposite change in aggregate production of $3 trillion. Two DifferencesThe key feature of the simple tax multiplier that differentiates it from the simple expenditures multiplier is how taxes affect aggregate expenditures. In particular, taxes do not affect aggregate expenditures directly (as do government purchases or investment expenditures). They affect aggregate expenditures indirectly through disposable income and consumption. This gives rise to two important differences compared to the simple expenditures multiplier. First, a change in taxes causes an opposite change in the disposable income of the household sector. An increase in taxes decreases disposable income and an decrease in taxes increases disposable income. This is why the simple tax multiplier has a negative value.
 Second, the household sector reacts to the change in disposable income caused by the change in taxes by changing both consumption and saving. How much consumption changes is based on the MPC. The MPC means that for each one dollar change in taxes, consumption and thus aggregate expenditures change by a only fraction. The fraction is equal to the MPC. The reason, of course, is that the taxes affect income and income is divided between saving and taxes.
Suppose, for example, that the government sector reduces taxes by $1 trillion with the goal of stimulating aggregate production and warding off a businesscycle contraction. This tax reduction increases disposable income by $1 trillion. The household sector spends part and saves part of this income. The division between consumption and saving is based on the marginal propensities to consume and save.If the marginal propensity to consume is 0.75, then consumption increases by $750 billion. This $750 billion change in consumption then triggers the multiplier process much like that for an autonomous change in investment expenditures. The difference, however, is the full $1 trillion change in investment triggers the multiplier process, but only 75 percent of the change in taxes works its way into the multiplier. More Complex Tax MultipliersThe simple tax multiplier assumes that consumption is the only induced component. In the real world, however, consumption is not the only induced expenditure. Investment, government purchases, taxes, and net exports (through imports) are also induced. A more complete, more realistic, and more complex multiplier includes induced components.Here is the formula for just such a multiplier, which can be labeled m[taxall]. m[taxall]  =   MPC {1  [MPC + MPI + MPG  (MPC x MPT)  MPM]} 
This particular multiplier has a number of abbreviations containing the letters "MP." These are the assorted induced components, with "MP" standing for marginal propensity. In fact, the batch of abbreviations within the brackets "[]" is actually the slope of the aggregate expenditures line.Let's run through the cast of characters in this formula.  MPC is the marginal propensity to consume.
 MPI is the marginal propensity to invest.
 MPG is the marginal propensity for government purchases.
 MPT is the marginal propensity to tax.
 MPM is the marginal propensity to import.
This complex tax multiplier can be used to determine the change in aggregate production resulting from a change in taxes.This particular tax multiplier formulation includes all induced components. However, several other tax multipliers that include different combinations of these induced components can be identified. One multiplier can include only induced consumption and induced investment. Another can include induced consumption, induced government purchases, and induced taxes. The possibilities are almost endless. Other MultipliersThe tax multiplier is one of several Keynesian multipliers. Two other related multipliers are expenditures multiplier and balancedbudget multiplier. Expenditures Multiplier: The expenditures multiplier measures changes in aggregate production caused by changes in an autonomous expenditure. Like the tax multiplier this comes in several varieties, simple and complex, depending on which expenditures and other components are induced by aggregate production and income. It differs from the tax multiplier in that aggregate expenditures change by full amount of the autonomous change.
 BalancedBudget Multiplier: The balancedbudget multiplier measures the combined impact on aggregate production of equal changes in government purchases and taxes. The simple balancedbudget multiplier has a value equal to one.
Two other multipliers arise from the financial, or money, side of the economy. They are the deposit expansion multiplier and the money multiplier. The deposit expansion multiplier measures the change in bank deposits caused by a change in bank reserves. The money multiplier measures the change in money caused by a change in bank reserves. Both are useful in the analysis of monetary policy.
Recommended Citation:TAX MULTIPLIER, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 20002019. [Accessed: May 22, 2019]. Check Out These Related Terms...           Or For A Little Background...             And For Further Study...     
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