Real Money Demand Depends On Time
Real Money Demand Function
Real Money Demand Depends On Information
Real Money Demand Depends On The Point
Demand For Real Money Balances Depends On Disposable Income

Figure 15-1 shows how aggregate real money demand is affected by the interest rate for a fixed level of real income, Y. The aggregate real money demand schedule L(R, Y) slopes downward because a fall in the interest rate raises the desired real money holdings of each household and firm in the economy. Suppose that the demand for real money balances depends on disposable income. That is, the money demand function is M/P = L(r, Y-T). Using the IS-LM model, discuss whether this change in the money demand function alters the following. A.) The analysis of changes in government purchases. Suppose that the demand for real money balances depends on disposable income. That is, the money demand function is M/P = L(r, Y-T). Using the IS-LM model, discuss whether this change in the money demand function alters the following. A.) The analysis of changes in government purchases. Figure 25.12 An Increase in the Money Supply. The Fed increases the money supply by buying bonds, increasing the demand for bonds in Panel (a) from D1 to D2 and the price of bonds to Pb2. This corresponds to an increase in the money supply to M ′ in Panel (b). The interest rate must fall to r2 to achieve equilibrium.

The article mentioned below provides an algebraic analysis of IS-LM model.

The Derivation of IS Curve: Algebraic Method:

The IS curve is derived from goods market equilibrium. The IS curve shows the combinations of levels of income and interest at which goods market is in equilibrium, that is, at which aggregate demand equals income.

Aggregate demand consists of consumption demand, investment demand, government expenditure on goods and services and net exports.

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Consumption demand is function of disposable income. Disposable income is level of income minus taxes (Y_d= Y – T) where Y_d stands for disposable income and T for taxes. However, in a two-sector model where we do not incorporate taxation by the government, Y_d= Y.

Investment depends on rate of interest. With a given level of income, a higher rate of interest reduces investment demand and a lower rate of interest leads to more investment, that is, investment is negatively related to rate of interest. Thus,

I = I – di

Therefore, we have the following equation for aggregate demand (AD)

1/1-b is the income multiplier and b is marginal propensity to consume. Given the value of autonomous expenditure, we can obtain value of Y at different rates of interest to draw an IS curve. It is worth noting that the value of autonomous (A) determines the intercept of the IS curve, d in the term di in equation (3) shows the sensitivity of investment to the changes in rate of interest and determines the slope of IS curve. Since fall in interest rate increases investment spending, it will raise aggregate demand and thus the equilibrium level of income. Besides, the slope of the IS curve depends on the size of income multiplier.

Problem 1:

The following equations describe an economy:

C = 10 + 0.5 Y (Consumption function)

I = 190-20i (Investment function)

Derive the equations for IS curve and represent it graphically.

At 2 per cent rate of interest, level of income is 320.

We have now two combinations of interest and income. We can plot these and obtain IS curve. This is done in Figure 20.18.

IS Curve: Three-Sector Model with Taxation and Transfer Payments:

In the last section we have derived the IS curve taking government expenditure G on goods and services without considering taxation and transfer payments by it. In fact the concept of consumption function conceives consumption as a function of disposable income and is therefore written as

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C = a + bY_D …(1)

Now, disposable income Y^D is obtained from deducting tax and adding transfer payments by the government. Thus

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Y_D = Y – T + R

where T is tax revenue and R is the transfer payments by the government. Whereas a tax reduces disposable income, transfer payment raises it.

Further, whereas transfer payments are assumed as lump sum amount, tax can be lump sum tax or levied as proportion of income. If we assume proportionate income tax, then,

T = tY

where t is the proportion of income which is taken away by way of tax. …(2)

Let us derive IS equation incorporating proportionate income tax and lump sum transfer payments.

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where 1/1-b(1-t) is the value of multiplier in case of proportionate income tax. Equation (4) represents IS curve in case of proportionate income tax.

It may be noted in the context of IS equations (3) and (4) that a change in autonomous spending (A) as a result of any of its components will cause a shift in IS curve.

Problem 2:

The following equations describe an economy:

Derivation of LM Curve: Algebraic Analysis:

Having derived algebraically equation for IS curve we now turn to the derivation of equation for LM curve. It will be recalled that LM curve is a curve that shows combinations of interest rates and levels of income at which money market is in equilibrium, that is, at which demand for money equals supply of money.

We explain the derivation of LM curve in two steps. First, we show how money demand depends on interest rate and level of income. It is worth noting that in their demand for money people care more about the purchasing power of money, that is, people’s demand is for real money balances rather than nominal money balances. Real money balances are given by M/P where M stands for nominal money demand and p for price level.

The demand for real money balances depends on the level of real income and interest rate. Thus M_d= L(Y, i). Demand for real money balances increases with the rise in level of income and decreases with rise in rate of interest. Let us assume that money demand function is linear. Then

L(Y, i) = kY – hi k, h > 0 …(5)

Parameter k represents how much demand for real money balances increases when level of income rises. Parameter h represents Low much demand for real money balances decreases when rate of interest rises. The equilibrium in the money market is established where demand for real money balances equals supply of real money balances and is given by

M/P = kY – hi …(6)

Money supply (M) is set by the central bank of a country and we assume it to remain constant for a period. Besides, we assume the price level (P) to remain constant.

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Solving the equation (6) for interest rate we have

i = 1/h (kY – M/P) …(7)

The above equation (7) describes the equation for LM curve. To be precise it gives us the equilibrium interest rate for any given value of level of income (Y) and real money balances. In drawing LM curve, real money balances are assumed to be constant.

Thus LM curve describes money market equilibrium for different values of income and rate of interest, given a fixed value of real money balances (M/P). Thus, given the real money balances (M/P), we can obtain a rate of interest for different values of income.

Let us state some conclusions about LM curve as given by equation (7). First, since in equation (7) for LM curve, the coefficient (k) of income (Y) is

Real Money Demand Depends On