The balanced budget multiplier is not affected by:

Q: The balanced budget multiplier is not affected by:

The balanced budget multiplier is not affected by:

Question

Accepted Answer

The correct option is 3:
The balanced budget multiplier (BBM) concept states that when government spending (G) and taxes (T) are increased by the same amount, the resulting increase in equilibrium national income ($\Delta Y$) is exactly equal to the increase in G (or T), meaning the multiplier is always 1. This simple result is derived under the assumption that the multiplier is only dependent on the Marginal Propensity to Consume (MPC) and the leakages from the circular flow of income. Since the formula for the simple BBM is 1/MPC - MPC/(1-MPC), which simplifies to 1, or in a more complex model (where leakage includes MPS, MPI, and proportional tax rate 't'), the BBM is calculated using marginal propensities to consume, save, import, and the tax rate. The investment function, which determines the overall level of autonomous investment, shifts the Aggregate Demand curve, affecting the equilibrium level of income, but *not* the multiplier itself. The multiplier is based on the *slopes* of the leakage functions, not the level of autonomous spending (like investment).

The incorrect option is 1:
The Marginal Propensity to Save (MPS) is a direct leakage from the income stream (MPS = 1 - MPC). In calculating the multiplier, the denominator includes the MPS, as it reduces the re-spending effect, thus influencing the value of the tax and expenditure multipliers, and consequently, the balanced budget multiplier.

The incorrect option is 2:
The Marginal Propensity to Import (MPI) is another important leakage in an open economy model. Like MPS, MPI reduces the proportion of income that is re-spent domestically, which dampens the overall multiplier effect. Therefore, MPI must be included in the denominator of the full multiplier calculation, affecting the BBM's derivation.

The incorrect option is 4:
A proportional income tax rate levied by the government introduces another leakage. A tax rate 't' makes leakages dependent on income, reducing the size of the overall spending multiplier. Thus, the proportional income tax rate directly impacts the magnitude of both the tax and spending multipliers, which are used to derive the balanced budget multiplier.