1. The Determinants of Interest Rates: Competing Ideas
Chapter 5
The Determinants of Interest Rates: Competing Ideas

2.  Learning Objectives 
To understand the important roles that interest rates play within the economy.
To explore the most important ideas about what determines the level of interest rates and asset prices within the financial system.
To identify the key forces that economists believe set market interest rates and asset prices into motion.

3. Introduction
The acts of saving and lending, and borrowing and investing, are significantly influenced by and tied together by the interest rate.
The interest rate is the price a borrower must pay to secure scarce loanable funds from a lender for an agreed-upon time period.

4. Introduction
Some authorities refer to the rate of interest as the price of credit.
Interest rates send price signals to borrowers, lender, savers, and investors.
Whether higher interest rates increase or decrease savings and investment depends on the relative strength of its effect on supply and demand factors.

5. Functions of the Interest Rate in the Economy
The interest rate helps guarantee that current savings will flow into investment to promote economic growth.
It allocates the available supply of credit, generally providing loanable funds to those investment projects with the highest expected returns.
It brings the supply of money into balance with the public’s demand for money.

6. Functions of the Interest Rate in the Economy
The interest rate serves as an important tool for government policy through its influence on the volume of savings and investment.

7. Functions of the Interest Rate in the Economy
To help uncover these rate-determining forces, we assume that there is one fundamental interest rate, known as the pure or risk-free rate of interest, which is a component of all interest rates.
The closest real-world approximation to this pure rate of return is the market interest rate on government bonds.

8. The Classical Theory of Interest Rates
The classical theory argues that the rate of interest is determined by two forces:
the supply of savings, derived mainly from households, and
the demand for investment capital, coming mainly from the business sector.

9. The Classical Theory of Interest Rates
Household Savings
Current household savings equal the difference between current income and current consumption expenditures.
Individuals prefer current over future consumption, and the payment of interest is a reward for waiting.
Higher interest rates encourage the substitution of current saving for current consumption.

10. The Classical Theory of Interest Rates
The Substitution Effect
Relating Savings and Interest Rates
Interest
Rate
Current
Saving  r1 S1 r2  S2

11. The Classical Theory of Interest Rates
Business and Government Savings
Most businesses hold savings balances in the form of retained earnings, the amount of which is determined principally by business profits, and to a lesser extent, by interest rates.
Income flows in the economy and the pacing of government spending programs are the dominant factors affecting government savings (budget surplus).

12. The Classical Theory of Interest Rates
The Demand for Investment Funds
Gross business investment equals the sum of replacement investment and net investment.
One investment decision-making method involves the calculation of a project’s expected internal rate of return, and the comparison of that expected return with the anticipated returns of alternative projects, as well as with market interest rates.

13. The Classical Theory of Interest Rates
The Demand for Investment Funds … continued
The internal rate of return (r) equates the total cost of an investment project with the future net cash flows (NCF) expected from that project discounted back to their present values.
Cost of project =
Another method of investment analysis is the net present value (NPV) approach.

14. The Classical Theory of Interest Rates
The Cost of Capital and the Business Investment Decision A
15% B
12% C
10% D 8% E 7%
Dollar Cost of Investment Projects
Expected Internal Rates of Return on Alternative Investment Projects
Cost of Capital Funds = 10% C
10% D 8% E 7%
– acceptable
– indifferent
unprofitable

15. The Classical Theory of Interest Rates
The Investment Demand Schedule
In the Classical Theory of Interest Rates
Interest
Rate
Investment
Spending  r1 I1 r2  I2

16. The Classical Theory of Interest Rates
The Equilibrium Rate of Interest In the Classical Theory
Interest
Rate
Savings &
Investment rE QE 
Savings

17. The Classical Theory of Interest Rates
Limitations
Factors other than savings and investment that affect interest rates are ignored. For example, many financial institutions can “create” money today by making loans to the public.
Today, economists recognize that income is more important than interest rates in determining the volume of savings.

18. The Classical Theory of Interest Rates
Limitations … continued
In addition to the business sector, both consumers and governments are also important borrowers today.

19. The Liquidity Preference (Cash Balances) Theory of Interest Rates
The liquidity preference (or cash balances) theory of interest rates is a short-term theory that was developed for explaining near-term changes in interest rates, and hence, is more relevant for policymakers.
According to the theory, the rate of interest is the payment to money (cash balances) holders for the use of their scarce resource (liquidity), by those who demand liquidity (i.e. money or cash balances).

20. The Liquidity Preference (Cash Balances) Theory of Interest Rates
The demand for liquidity stems from:
the transactions motive - the purchase of goods and services
the precautionary motive - to cope with future emergencies and extraordinary expenses
the speculative motive - a rise in interest rates results in lower bond prices
 and  depend on the level of national income, business sales, and prices (but not interest rates) So, demand due to  and  is fixed in the short term.

21. Speculative Demand for Money or Cash Balances

22. The Total Demand for Money or Cash Balances And the Equilibrium Rate of Interest

23. The Liquidity Preference (Cash Balances) Theory of Interest Rates
In modern economies, the money supply is controlled, or at least closely regulated, by the government.
The supply of money (cash balances) is often assumed to be inelastic with respect to interest rates, since government decisions concerning the size of the money supply should presumably be guided by public welfare.

24. The Liquidity Preference (Cash Balances) Theory of Interest Rates
The Equilibrium Interest Rate
In the Liquidity Preference Theory
Interest
Rate
Quantity of
Money / Cash
Balances
Equilibrium interest rate 
Total
Demand QE
Money
Supply

25. The Liquidity Preference (Cash Balances) Theory of Interest Rates
Limitations
The liquidity preference theory is a short-term approach. In the longer term, the assumption that income remains stable does not hold.
Only the supply and demand for money is considered. A more comprehensive view that considers the supply and demand for credit by all actors in the financial system - businesses, households, and governments - is needed.

26. The Loanable Funds Theory of Interest
The popular loanable funds theory argues that the risk-free interest rate is determined by the interplay of two forces:
the demand for credit (loanable funds) by domestic businesses, consumers, and governments, as well as foreign borrowers
the supply of loanable funds from domestic savings, dishoarding of money balances, money creation by the banking system, as well as foreign lending

27. The Loanable Funds Theory of Interest
The Demand for Loanable Funds
Consumer (household) demand is relatively inelastic with respect to the rate of interest.
Domestic business demand increases as the rate of interest falls.
Government demand does not depend significantly upon the level of interest rates.
Foreign demand is sensitive to the spread between domestic and foreign interest rates.

28. The Loanable Funds Theory of Interest
Total Demand for Loanable Funds (Credit)
Interest
Rate
Amount of
Loanable Funds
Total Demand = Dconsumer +
Dbusiness +
Dgovernment +
Dforeign

29. The Loanable Funds Theory of Interest
The Supply of Loanable Funds
Domestic Savings. The net effect of income, substitution, and wealth effects is a relatively interest-inelastic supply of savings curve.
Dishoarding of Money Balances. When individuals and businesses dispose of their excess cash holdings, the supply of loanable funds available to others is increased.

30. The Loanable Funds Theory of Interest
The Supply of Loanable Funds … continued
Creation of Credit by the Domestic Banking System. Commercial banks and nonbank thrift institutions offering payments accounts can create credit by lending and investing their excess reserves.
Foreign lending is sensitive to the spread between domestic and foreign interest rates.

31. The Loanable Funds Theory of Interest
Total Supply of Loanable Funds (Credit)
Interest
Rate
Amount of
Loanable Funds
Total Supply
= domestic savings +
newly created money +
foreign lending –
hoarding demand

32. The Loanable Funds Theory of Interest
The Equilibrium Interest Rate
Interest
Rate
Amount of
Loanable Funds rE QE 
Demand
Supply

33. The Loanable Funds Theory of Interest
At equilibrium:
Planned savings = planned investment across the whole economic system
Money supply = money demand
Supply of loanable funds = demand for loanable funds
Net foreign demand for loanable funds = net exports

34. The Loanable Funds Theory of Interest
Interest rates will be stable only when the economy, money market, loanable funds market, and foreign currency markets are simultaneously in equilibrium.

35. Changes in the Demand for and Supply of Loanable Funds

36. Changes in the Demand for and Supply of Loanable Funds

37. The Rational Expectations Theory of Interest
The rational expectations theory builds on a growing body of research evidence that the money and capital markets are highly efficient in digesting new information that affects interest rates and security prices.

38. The Rational Expectations Theory of Interest
The public forms rational and unbiased expectations about the future demand and supply of credit, and hence interest rates.
Interest
Rate
Amount of
Loanable Funds rE QE 
Expected Demand
Expected Supply

39. The Rational Expectations Theory of Interest
If the money and capital markets are highly efficient, then interest rates will always be very near their equilibrium levels, and the optimal forecast of next period’s interest rate is the current interest rate.
Interest rates will change only if entirely new and unexpected information appears, and the direction of change depends on the public’s current set of expectations.

40. Expected Demand for and Supply of Loanable Funds

41. The Rational Expectations Theory of Interest
Limitations
At the moment, we do not know very much about how the public forms its expectations.
The cost of gathering and analyzing information relevant to the pricing of assets is not always negligible, as assumed.
Not all interest rates and security prices appear to display the kind of behavior implied by the rational expectations theory.

42. Markets on the Net Bank Rate.com at www.bankrate.com
Bond Market Association at
CNN/Money at
European Central Bank at
Federal Reserve System at
National Endowment for Financial Education at

43. Chapter Review Introduction: Interest Rates and the Price of Credit
Functions of the Interest Rate in the Economy
The Classical Theory of Interest Rates
Savings by Households, Business Firms and Governments
The Demand for Investment Funds
The Equilibrium Interest Rate
Limitations of the Classical Theory

44. Chapter Review
The Liquidity Preference or Cash Balances Theory of Interest Rates
The Demand for Liquidity
The Supply of Money (Cash Balances)
The Equilibrium Interest Rate
Limitations of the Liquidity Preference Theory

45. Chapter Review The Loanable Funds Theory of Interest
The Demand for Loanable Funds
The Supply of Loanable Funds
The Equilibrium Interest Rate
The Rational Expectations Theory of Interest