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Tax multiplier in IS-LM model

Economics Asked by Anya Pilipentseva on February 19, 2021

I should consider a following modification of IS-LM model:

IS curve is standard: Y = C(Y-T) + I(r) + G

In LM curve the demand for money depends now on after tax income: M/P = L(r, Y-T)

Price level is fixed in the short run

I need to solve for tax multiplier.

What I have done is that I took the full differential of two equations and got the following:

  1. dY = C'(Y-T)dY – C'(Y – T) + I’dr + dG

  2. 1/pdM – M/p^2 * dP = Lr * dr + Ly * dy – Lt dT

Lr, Ly, Lt are partial derivatives

Next the book gives a hint to use Cramer’s rule to solve for tax multiplier, but I am not sure how I can do it. Because to me it seems that I have 2 equations and 3 unknown variables

One Answer

Hint:

The $T$ is variable itself so the total differential should read as:

$$dY = C'dY - C'dT + I'dr + dG implies dY = frac{1}{1-C'}I 'dr + frac{1}{1-C'}dG - frac{C'}{1-C'}dT$$

Furthermore, by Fisher equation $r=i-pi$. Hence we have:

$$dY = frac{1}{1-C'}I 'di - frac{1}{1-C'}I 'dpi + frac{1}{1-C'}dG - frac{C'}{1-C'}dT$$

$$(1/P)dM - (M/P^2) dP = L_r'dr + L_Y' dY - L_T'dT$$

again use the Fisher so:

$$(1/P)dM - (M/P^2) dP = L_i'di - L_{pi}'d pi + L' dY - L'dT$$

This is IS-LM model so you are looking for equilibrium output and nominal interest rate $dY$ and $di$. You have two equations and two unknowns. You can solve it even with substitution but you should probably follow the textbook's advice to use Cramer's rule.

Correct answer by 1muflon1 on February 19, 2021

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