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Chapter Two. Determinants of Interest Rates. Interest Rate Fundamentals. Nominal interest rates - the interest rate actually observed in financial markets directly affect the value (price) of most securities traded in the market affect the relationship between spot and forward FX rates.

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Chapter Two

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Chapter two

Chapter Two

Determinants of

Interest Rates

Interest rate fundamentals

Interest Rate Fundamentals

  • Nominal interest rates - the interest rate actually observed in financial markets

    • directly affect the value (price) of most securities traded in the market

    • affect the relationship between spot and forward FX rates

Time value of money and interest rates

Time Value of Money and Interest Rates

  • Assumes the basic notion that a dollar received today is worth more than a dollar received at some future date

  • Compound interest

    • interest earned on an investment is reinvested

  • Simple interest

    • interest earned on an investment is not reinvested

Calculation of simple interest

Calculation of Simple Interest

Value = Principal + Interest


$1,000 to invest for a period of two years at 12 percent

Value = $1,000 + $1,000(.12)(2)

= $1,240

Value of compound interest

Value of Compound Interest

Value = Principal + Interest + Compounded interest

Value = $1,000 + $1,000(12)(2) + $1,000(12)(2)

= $1,000[1 + 2(12) + (12)2]

= $1,000(1.12)2

= $1,254.40

Present values

Present Values

  • PV function converts cash flows received over a future investment horizon into an equivalent (present) value by discounting future cash flows back to present using current market interest rate

    • lump sum payment

      • a single cash payment received at the end of some investment horizon

    • annuity

      • a series of equal cash payments received at fixed intervals over the investment horizon

  • PVs decrease as interest rates increase

Calculating present value pv of a lump sum

Calculating Present Value (PV) of a Lump Sum

PV = FVn(1/(1 + i/m))nm = FVn(PVIFi/m,nm)


PV = present value

FV = future value (lump sum) received in n years

i = simple annual interest

n = number of years in investment horizon

m = number of compounding periods in a year

PVIF = present value interest factor of a lump sum

Calculation of present value pv of an annuity

Calculation of Present Value (PV) of an Annuity


PV = PMT  (1/(1 + i/m))t = PMT(PVIFAi/m,nm)

t = 1


PV = present value

PMT = periodic annuity payment received

during investment

i = simple annual interest

n = number of years in investment horizon

m = number of compounding periods in a year

PVIFA = present value interest factor of an annuity

Calculation of present value of an annuity

Calculation of Present Value of an Annuity

You are offered a security investment that pays $10,000 on the last day of every quarter for the next 6 years in exchange for a fixed payment today.

PV = PMT(PVIFAi/m,nm)

at 8% interest - = $10,000(18.913926) = $189,139.26

at 12% interest - = $10,000(16.935542) = $169,355.42

at 16% interest - = $10,000(15.246963) = $152,469.63

Future values

Future Values

  • Translate cash flows received during an investment period to a terminal (future) value at the end of an investment horizon

  • FV increases with both the time horizon and the interest rate

Future values equations

Future Values Equations

  • FV of lump sum equation

    • FVn = PV(1 + i/m)nm = PV(FVIF i/m, nm)

  • FV of annuity payment equation

    • (nm-1)

    • FVn = PMT (1 + i/m)t = PMT(FVIFAi/m, mn)

    • (t = 1)

Relation between interest rates and present and future values

Relation between Interest Rates and Present and Future Values







Interest Rate

Interest Rate

Equivalent annual return ear

Equivalent Annual Return (EAR)

Rate returned over a 12-month period

taking the compounding of interest into


EAR = (1 + i/m)m - 1

At 8% interest - EAR = (1 + .08/4)4 - 1 = 8.24%

At 12% interest - EAR = (1 + .12/4)4 - 1 = 12.55%

Discount yields

Discount Yields

Money market instruments (e.g., Treasury

bills and commercial paper) that are bought

and sold on a discount basis

idy = [(Pt - Po)/Pf](360/h)


Pf = Face value

Po = Discount price of security

Single payment yields

Single Payment Yields

Money market securities (e.g., jumbo CDs,

fed funds) that pay interest only once during

their lives: at maturity

ibey = ispy(365/360)

Loanable funds theory

Loanable Funds Theory

  • A theory of interest rate determination that views equilibrium interest rates in financial markets as a result of the supply and demand for loanable funds

Supply of loanable funds

Supply of Loanable Funds





Quantity of Loanable Funds

Supplied and Demanded

Funds supplied and demanded by various groups in billions of dollars

Funds Supplied and Demanded by Various Groups (in billions of dollars)

Funds SuppliedFunds Demanded

Households $31,866.4 $ 6,624.4

Business -- nonfinancial 7,400.0 30,356.2

Business -- financial 27,701.9 29,431.1

Government units 6,174.8 10,197.9

Foreign participants 6,164.8 2,698.3

Determination of equilibrium interest rates

Determination of Equilibrium Interest Rates










Quantity of Loanable Funds

Supplied and Demanded

Effect on interest rates from a shift in the demand curve for or supply curve of loanable funds

Effect on Interest rates from a Shift in the Demand Curve for or Supply curve of Loanable Funds

Increased supply of loanable funds

Increased demand for loanable funds





















Quantity of

Funds Supplied

Quantity of

Funds Demanded

Factors affecting nominal interest rates

Factors Affecting Nominal Interest Rates

  • Inflation

    • continual increase in price of goods/services

  • Real Interest Rate

    • nominal interest rate in the absence of inflation

  • Default Risk

    • risk that issuer will fail to make promised payment


Chapter two

  • Liquidity Risk

    • risk that a security can not be sold at a predictable price with low transaction cost on short notice

  • Special Provisions

    • taxability

    • convertibility

    • callability

  • Time to Maturity

Inflation and interest rates the fischer effect

Inflation and Interest Rates: The Fischer Effect

The interest rate should compensate an investor

for both expected inflation and the opportunity

cost of foregone consumption

(the real rate component)

i = Expected (IP) + RIR

Example: 5.08% - 2.70% = 2.38%

Default risk and interest rates

Default Risk and Interest Rates

The risk that a security’s issuer will default

on that security by being late on or missing

an interest or principal payment

DRPj = ijt - iTt

Example: DRPAaa = 7.55% - 6.35% = 1.20%

DRPBbb = 8.15% - 6.35% = 1.80%

Tax effects the tax exemption of interest on municipal bonds

Tax Effects: The Tax Exemption of Interest on Municipal Bonds

Interest payments on municipal securities are exempt from federal taxes and possibly state and local taxes. Therefore, yields on “munis” are generally lower than on equivalent taxable bonds such as corporate bonds.

im = ic(1 - ts - tF)

Where: ic = Interest rate on a corporate bond

im = Interest rate on a municipal bond

ts = State plus local tax rate

tF = Federal tax rate

Term to maturity and interest rates yield curve

Term to Maturity and Interest Rates: Yield Curve

(a) Upward sloping

(b) Inverted or downward


(c) Humped

(d) Flat

Yield to






Time to Maturity

Term structure of interest rates

Term Structure of Interest Rates

  • Unbiased Expectations Theory

    • at a given point in time, the yield curve reflects the market’s current expectations of future short-term rates

  • Liquidity Premium Theory

    • investors will only hold long-term maturities if they are offered a premium to compensate for future uncertainty in a security’s value

  • Market Segmentation Theory

    • investors have specific maturity preferences and will demand a higher maturity premium

Forecasting interest rates

Forecasting Interest Rates

Forward rate is an expected or “implied” rate

on a security that is to be originated at some

point in the future using the unbiased

expectations theory


R2 = [(1 + R1)(1 + (f2))]1/2 - 1


f2 = expected one-year rate for year 2, or the implied

forward one-year rate for next year

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