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**How to calculate present values**

Money, it's a crime. Share it fairly but don't take a slice of my pie. Money, so they say Is the root of all evil today. But if you ask for a raise it's no surprise that they're giving none away. (Waters)

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**Perpetuity: Constant Payment Forever**

PV = PMT/i This is the present value of receiving a constant payment forever.

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**Valuing perpetuities C r EXAMPLE:**

Suppose you wish to endow a chair at your old university. The aim is to provide $100,000 forever and the interest rate is 10%. $100,000 PV = = $1,000,000 .10 A donation of $1,000,000 will provide an annual income of .10 x $1,000,000 = $100,000 forever. PV =

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**Future Value of a Lump Sum**

FV = PV * (1+i)n Why is this formula correct? This is the amount that will be accumulated by investing a given amount today for n periods at a given interest rate.

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**Simple & compound interest**

Simple interest rates) are calculated by multiplying the rate per period by the number of periods. Compound interest rates recognize the opportunity to earn interest on interest. i ii iii iv v Periods Interest Value Annually per per APR after compounded year period (i x ii) one year interest rate % % % = = = = =

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**Effective Annual Rate (EAR) or Yield (EAY)**

EAR or EAY = (1+inom/m)m-1 This is used to calculate the compounded yearly rate. It considers interest being earned on interest.

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**FV With Compounding Intervals**

FV of lump sum for various compounding intervals: FV = PV * (1+i/m)n*m where m=number of compounding periods per year At an extreme there could be continuous compounding, then FV can be calculated as follows: FV = PV (ein) where e=

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**PV of a Lump Sum PV=FV/(1+i)n**

This is the value today of a future lump sum to be received in the future after n periods of time at a given discount rate.

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**Present values example: saving for a new computer**

Suppose: - you need $3000 next year to buy a computer - the interest rate = 8% per year How much do you need to set aside now? 3000 PV of $3000 = = x = $ 1.08 1- year discount factor By end of 1 year $ grows to $ x 1.08 = $3000 Suppose you can postpone purchase until Year 2. PV = = x = $ 1.082 2-year

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**PV With Compounding Intervals**

PV of a lump sum for various compounding intervals is calculated as: PV=FV/(1+i/m)n*m where m=number of compounding periods per year At an extreme there could be continuous discounting, then PV=FV/(ein) where e=

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**PV of an Annuity PV=SA/(1+i)n = A*{(1/i) - (1/i) [1/(1+i)n]}**

This is the value today of a series of equal payments to be received at the end of each period for n periods at a given interest rate.

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**An annuity is equal to the difference between two perpetuities**

Asset Year of payment PV t t+1 . . Perpetuity (first payment year 1) payment year t + 1) Annuity from year 1 to year t C r ( C ) 1 r (1+r) t C C 1 ( ) - r r (1+r) t

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**Using the annuity formula Example: valuing an 'easy payment' scheme**

Suppose: a car purchase involves 3 annual payments of $4000 the interest rate is 10% a year PV = $4000 x (1.10)3 = $4000 x = $ ANNUITY TABLE Number Interest Rate of years % % %

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**FV of an Annuity FV=SA* (1+i)n = A*{[(1+i)n -1]/i}**

This is the accumulated value of equal payments for n years at a given interest rate.

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Annuity Due Annuity due: Payments received at the beginning of each period. Will be worth more (higher PV) since it gets payments sooner. Will have higher FV since it has one extra period to earn interest. Calculations are the same as before except now we multiply by (1+i).

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**Solving for Annuity Payments (Present Value)**

Recall that PV=A*{(1/i) - (1/i) [1/(1+i)n]}, then A=PV/{(1/i) - (1/i) [1/(1+i)n]} A is the payment necessary for n years at given interest rate to amortize a present (loan) amount.

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**Solving for Annuity Payments (Future Value)**

Recall that FV=A*{[(1+i)n-1]/i}, then A=FV/{[(1+i)n-1]/i} A is the amount needed to be invested each period at a given interest rate to accumulate a desired future amount at the end of n years.

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**Solving for Rate of Return (i)**

For Lump Sum Case: Since PV=FV/(1+i)n, then (1+i)n=FV/PV, and it follows that (1+i) = (FV/PV)1/n, and therefore i= (FV/PV)1/n-1

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**Solving for Rate of Return (i)**

Annuities: In the annuity case, you could also solve for i using annuity relationship once you know the annuity. You do not need a cash flow register.

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**Solving for Rate of Return (r) with uneven cash flows**

Spreadsheets (use financial function =IRR) Financial calculators (IRR using cash flow register) Manual (Trial and error until PV of all cash flows equal zero) C C2 (1 + r) (1 + r)2

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**Solving for Number of Periods (n)**

Since PV=FV/(1+i)n, then (1+i)n=FV/PV, and it follows that nLN(1+i)=LN(FV/PV), and therefore n=LN(FV/PV)/LN(1+i)

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**Net Present Value in the General discounted cash flow formula**

NPV = C Note: It is today’s cost of capital that matters C C2 (1 + r) (1 + r)2

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**Example If C0 = -500, C1 = +400, C2 = +400 r1 = r2 = .12**

NPV = = (.893) (.794) = = (1.12)2

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**Growing perpetuities C (r - g) PV = EXAMPLE:**

Next year’s cash flow = $100 Constant expected growth rate = 10% Cost of capital = 15% = = 2000 next year’s cash flow cost of capital - growth rate 100

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**Valuing bonds Some definitions:**

BOND Long-term debt issued by government or firms COUPON Regular interest payment on bond FACE VALUE Amount repaid at maturity (usually $1000) Example: A Treasury 9% coupon bond matures in 1998. In 1993 each bond offered these cash flows: $ $ $ $ $1090 The interest rate on similar bonds was 5.3%. Therefore the value of 9% Treasuries was $ $ $ $ $1090 PV = (1 + r) (1 + r) (1 + r) (1 + r) (1 + r)5 $ $ $ $ $1090 = (1.053) (1.053) (1.053) (1.053)5 = $

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**Calculating bond yields**

If the price of the 9% Treasury bond is $ , what return do investors expect? Return is usually measured by the yield to maturity. This is the discount rate, r, that makes a bond's present value equal to price. $ $ $ $ $1090 PV = (1 + r) (1 + r) (1 + r) (1 + r) (1 + r)5 = $ Yield to maturity (r) = .053 or 5.3%.

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**How bond prices vary with interest rate (yield to maturity)**

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**How bond prices vary with interest rate (yield to maturity)**

Inverse relationship. As yields go up (down) prices on existing bonds go down (up). The longer the maturity, the more sensitive the bond prices are to interest rate changes.

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