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MONEY AND INFLATION (Continued…):Money demand and the nominal interest rate

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Macroeconomics ECO 403
VU
LESSON 12
MONEY AND INFLATION (Continued...)
The Fisher Effect
The Fisher equation:
i=r+
­  S = I determines r.
­  Hence, an increase in
causes an equal increase in i.
­  This one-for-one relationship
is called the Fisher effect.
Exercise:
Suppose V is constant, M is growing 5% per year, Y is growing 2% per year, and r = 4.
 Solve for i (the nominal interest rate).
 If SBP increases the money growth rate by 2 percentage points per year, find Δi .
 If the growth rate of Y falls to 1% per year
 What will happen to ?
 What must SBP do if it wishes to
keep constant?
Answers:
First, find = 5 - 2 = 3.
Then, find i = r + = 4 + 3 = 7.
�  Δi = 2, same as the increase in the money growth rate.
 If SBP does nothing, Δ� = 1.
To prevent inflation from rising, SBP must reduce the money growth rate by 1
percentage point per year.
Two real interest rates
= actual inflation rate
(not known until after it has occurred)
e = expected inflation rate
i ­ e = ex ante real interest rate:
what people expect at the time they buy a bond or take out a loan
i ­ = ex post real interest rate:
what people actually end up earning on their bond or paying on their loan
Money demand and the nominal interest rate
The Quantity Theory of Money assumes that the demand for real money balances depends
only on real income Y.
We now consider another determinant of money demand: the nominal interest rate.
The nominal interest rate i is the opportunity cost of holding money (instead of bonds or
other interest-earning assets).
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Macroeconomics ECO 403
VU
Hence, i ⇒ ↓ in money demand.
Linkages Among Money, Prices and Interest rate
Money
Supply
Nominal
Price
Inflation
Interest
Level
Rate
Rate
Money
Demand
The money demand function
(M P ) = L (i , Y )
d
(M/P) d = real money demand, depends
 negatively on i
i is the opportunity cost of holding money
 positively on Y
higher Y more spending so, need more money
(L is used for the money demand function because money is the most liquid asset.)
(M P )d = L (i ,Y )
= L (r +  e , Y )
When people are deciding whether to hold money or bonds, they don't know what inflation will
turn out to be.
Hence, the nominal interest rate relevant for money demand is r + e.
M
Equilibrium
= L (r +  e ,Y )
P
Supply of Real money balances
Real money demand
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Macroeconomics ECO 403
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What determines what
Variable
how determined (in the long run)
M
exogenous (SBP)
r
adjusts to make S = I
Y
Y = F (K , L )
M
P
adjusts to make
= L (i ,Y )
P
How P responds to ΔM
For given values of r, Y, and e,
a change in M causes P to change by the same percentage --- just like in the Quantity
Theory of Money.
What about expected inflation?
Over the long run, people don't consistently over- or under-forecast inflation, so e = on
average.
In the short run, e may change when people get new information.
EX: Suppose SBP announces it will increase M next year. People will expect next
year's P to be higher, so e rises.
This will affect P now, even though M hasn't changed yet.
How P responds to Δ�e
M
= L (r +  e ,Y )
P
For given values of r, Y, and M,
 e  ⇒ ↑ i (the Fisher effect)
⇒ ↓ (M P )
d
⇒ ↑ P to make (M P ) fall
to re-establish eq'm
The social costs of inflation
...fall into two categories:
1. Costs when inflation is expected
2. Additional costs when inflation is
different than people had expected.
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Table of Contents:
  1. INTRODUCTION:COURSE DESCRIPTION, TEN PRINCIPLES OF ECONOMICS
  2. PRINCIPLE OF MACROECONOMICS:People Face Tradeoffs
  3. IMPORTANCE OF MACROECONOMICS:Interest rates and rental payments
  4. THE DATA OF MACROECONOMICS:Rules for computing GDP
  5. THE DATA OF MACROECONOMICS (Continued…):Components of Expenditures
  6. THE DATA OF MACROECONOMICS (Continued…):How to construct the CPI
  7. NATIONAL INCOME: WHERE IT COMES FROM AND WHERE IT GOES
  8. NATIONAL INCOME: WHERE IT COMES FROM AND WHERE IT GOES (Continued…)
  9. NATIONAL INCOME: WHERE IT COMES FROM AND WHERE IT GOES (Continued…)
  10. NATIONAL INCOME: WHERE IT COMES FROM AND WHERE IT GOES (Continued…)
  11. MONEY AND INFLATION:The Quantity Equation, Inflation and interest rates
  12. MONEY AND INFLATION (Continued…):Money demand and the nominal interest rate
  13. MONEY AND INFLATION (Continued…):Costs of expected inflation:
  14. MONEY AND INFLATION (Continued…):The Classical Dichotomy
  15. OPEN ECONOMY:Three experiments, The nominal exchange rate
  16. OPEN ECONOMY (Continued…):The Determinants of the Nominal Exchange Rate
  17. OPEN ECONOMY (Continued…):A first model of the natural rate
  18. ISSUES IN UNEMPLOYMENT:Public Policy and Job Search
  19. ECONOMIC GROWTH:THE SOLOW MODEL, Saving and investment
  20. ECONOMIC GROWTH (Continued…):The Steady State
  21. ECONOMIC GROWTH (Continued…):The Golden Rule Capital Stock
  22. ECONOMIC GROWTH (Continued…):The Golden Rule, Policies to promote growth
  23. ECONOMIC GROWTH (Continued…):Possible problems with industrial policy
  24. AGGREGATE DEMAND AND AGGREGATE SUPPLY:When prices are sticky
  25. AGGREGATE DEMAND AND AGGREGATE SUPPLY (Continued…):
  26. AGGREGATE DEMAND AND AGGREGATE SUPPLY (Continued…):
  27. AGGREGATE DEMAND AND AGGREGATE SUPPLY (Continued…)
  28. AGGREGATE DEMAND AND AGGREGATE SUPPLY (Continued…)
  29. AGGREGATE DEMAND AND AGGREGATE SUPPLY (Continued…)
  30. AGGREGATE DEMAND IN THE OPEN ECONOMY:Lessons about fiscal policy
  31. AGGREGATE DEMAND IN THE OPEN ECONOMY(Continued…):Fixed exchange rates
  32. AGGREGATE DEMAND IN THE OPEN ECONOMY (Continued…):Why income might not rise
  33. AGGREGATE SUPPLY:The sticky-price model
  34. AGGREGATE SUPPLY (Continued…):Deriving the Phillips Curve from SRAS
  35. GOVERNMENT DEBT:Permanent Debt, Floating Debt, Unfunded Debts
  36. GOVERNMENT DEBT (Continued…):Starting with too little capital,
  37. CONSUMPTION:Secular Stagnation and Simon Kuznets
  38. CONSUMPTION (Continued…):Consumer Preferences, Constraints on Borrowings
  39. CONSUMPTION (Continued…):The Life-cycle Consumption Function
  40. INVESTMENT:The Rental Price of Capital, The Cost of Capital
  41. INVESTMENT (Continued…):The Determinants of Investment
  42. INVESTMENT (Continued…):Financing Constraints, Residential Investment
  43. INVESTMENT (Continued…):Inventories and the Real Interest Rate
  44. MONEY:Money Supply, Fractional Reserve Banking,
  45. MONEY (Continued…):Three Instruments of Money Supply, Money Demand