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The Time Value of Money

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What is Time Value? “a dollar received today is worth more than a dollar to be received tomorrow” That is because today’s dollar can be invested so that we have more than one dollar tomorrow

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**The Terminology of Time Value of Money**

PV FV 1 2 3 4 5 Today

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**The Terminology of Time Value of Money**

A timeline is a graphical device used to clarify the timing of the cash flows for an investment PV FV 1 2 3 4 5 Today

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**The Terminology of Time Value of Money**

A timeline is a graphical device used to clarify the timing of the cash flows for an investment PV FV 1 2 3 4 5 Today time period

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**The Terminology of Time Value of Money**

Present Value - An amount of money today, or the current value of a future cash flow PV FV 1 2 3 4 5 Today

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**The Terminology of Time Value of Money**

Present Value - An amount of money today, or the current value of a future cash flow PV FV 1 2 3 4 5 Today Future Value - An amount of money at some future time period

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**Calculating the Future Value**

Suppose that you have an extra $100 today that you wish to invest for one year. If you can earn 10% per year on your investment, how much will you have in one year? -100 ? 1 2 3 4 5

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**Calculating the Future Value (cont.)**

Suppose that at the end of year 1 you decide to extend the investment for a second year. How much will you have accumulated at the end of year 2? -100 ? 1 2 3 4 5

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**Calculating the Future Value (cont.)**

If you extended the investment for a third year, you would have: -100 ? 1 2 3 4 5

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**Calculating the Future Value (cont.)**

If you extended the investment for a third year, you would have:

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**Generalizing the Future Value**

Recognizing the pattern that is developing, we can generalize the future value calculations as follows:

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Compound Interest Note from the example that the future value is increasing at an increasing rate In other words, the amount of interest earned each year is increasing Year 1: $10 Year 2: $11 Year 3: $12.10 The reason for the increase is that each year you are earning interest on the interest that was earned in previous years in addition to the interest on the original principle amount

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**The Magic of Compounding**

On Nov. 25, 1626 Peter Minuit, a Dutchman, reportedly purchased Manhattan from the Indians for $24 worth of beads and other trinkets. Was this a good deal for the Indians? This happened about 371 years ago, so if they could earn 5% per year they would in 1997 have:

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**The Magic of Compounding**

On Nov. 25, 1626 Peter Minuit, a Dutchman, reportedly purchased Manhattan from the Indians for $24 worth of beads and other trinkets. Was this a good deal for the Indians? This happened about 371 years ago, so if they could earn 5% per year they would in 1997 have:

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**The Magic of Compounding**

If they could have earned 10% per year, they would have:

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**The Magic of Compounding**

If they could have earned 10% per year, they would have: That’s about 54,563 Trillion dollars!

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**Calculating the Present Value**

Example: A cash flow, the value at Year 1 is $2,000, discount rate is 6%. What is the present value? ? $2,000 1 2 3 4 5 2000 = 1,887 PV = (1.06)

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**Calculating the Present Value**

Example: A cash flow, the value at Year 2 is $2,000, discount rate is 6%. What is the present value? ? $2,000 1 2 3 4 5 2000 = 1,780 PV = (1.06)(1.06) (1.06)2

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**Calculating the Present Value**

Example: A cash flow, the value at Year 3 is $2,000, discount rate is 6%. What is the present value? ? $2,000 1 2 3 4 5

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**Calculating the Present Value**

Example: A cash flow, the value at Year 3 is $2,000, discount rate is 6%. What is the present value? ? $2,000 1 2 3 4 5 2000 = 1,679 PV = (1.06)3

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Present Value But we can turn this around to find the amount that needs to be invested to achieve some desired future value:

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**Why do we discount? Opportunities foregone If cash flow is risky**

Borrow & lend (financial markets, banks) Productive assets (plant, machinery, etc.) Consumption If cash flow is risky

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**Present Value: An Example**

Suppose that your five-year old daughter has just announced her desire to attend college. After some research, you determine that you will need about $100,000 on her 18th birthday to pay for four years of college. If you can earn 8% per year on your investments, how much do you need to invest today to achieve your goal?

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**Present Value: An Example**

Suppose that your five-year old daughter has just announced her desire to attend college. After some research, you determine that you will need about $100,000 on her 18th birthday to pay for four years of college. If you can earn 8% per year on your investments, how much do you need to invest today to achieve your goal?

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Annuities An annuity is a series of nominally equal payments equally spaced in time Annuities are very common: Rent Mortgage payments Car payment Pension income The timeline shows an example of a 5-year, $100 annuity 100 100 100 100 100 1 2 3 4 5

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**Present Value of an Annuity (cont.)**

? ? ? ? ? PV=? 100 100 100 100 100 1 2 3 4 5

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**Present Value of an Annuity (cont.)**

Using the example, and assuming a discount rate of 10% per year, we find that the present value is: 62.09 68.30 75.13 82.64 90.91 100 (1.10)3 100 (1.10)4 100 (1.10)5 379.08 100 (1.10) 100 (1.10)2 1 2 3 4 5

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**Present Value of an Annuity**

We can use the principle of value additivity to find the present value of an annuity, by simply summing the present values of each of the components:

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**Present Value of an Annuity (cont.)**

Using the example, and assuming a discount rate of 10% per year, we find that the present value is: 62.09 68.30 75.13 82.64 90.91 100 (1.10)3 100 (1.10)4 100 (1.10)5 100 (1.10) 100 (1.10)2 379.08 1 2 3 4 5

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**Present Value of an Annuity (cont.)**

Actually, there is no need to take the present value of each cash flow separately We can use a closed-form of the PVA equation instead:

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**Present Value of an Annuity (cont.)**

We can use this equation to find the present value of our example annuity as follows: This equation works for all regular annuities, regardless of the number of payments

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**The Future Value of an Annuity**

We can also use the principle of value additivity to find the future value of an annuity, by simply summing the future values of each of the components:

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**The Future Value of an Annuity (cont.)**

Using the example, and assuming a discount rate of 10% per year, we find that the future value is: } 146.41 133.10 121.00 = at year 5 110.00 100(1.10)4 100 (1.10)3 100 100(1.10)2 100(1.10) 1 2 3 4 5

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**The Future Value of an Annuity (cont.)**

Using the example, and assuming a discount rate of 10% per year, we find that the future value is: } 146.41 133.10 121.00 = at year 5 110.00 100(1.10)4 100 (1.10)3 100 100(1.10)2 100(1.10) 1 2 3 4 5

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**The Future Value of an Annuity (cont.)**

Just as we did for the PVA equation, we could instead use a closed-form of the FVA equation: This equation works for all regular annuities, regardless of the number of payments

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**The Future Value of an Annuity (cont.)**

We can use this equation to find the future value of the example annuity:

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Uneven Cash Flows Very often an investment offers a stream of cash flows which are not either a lump sum or an annuity We can find the present or future value of such a stream by using the principle of value additivity

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**Uneven Cash Flows: An Example (1)**

Assume that an investment offers the following cash flows. If your required return is 7%, what is the maximum price that you would pay for this investment? 100 200 300 1 2 3 4 5

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**Uneven Cash Flows: An Example (1)**

Assume that an investment offers the following cash flows. If your required return is 7%, what is the maximum price that you would pay for this investment? 100 200 300 1 2 3 4 5

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**Uneven Cash Flows: An Example (2)**

Suppose that you were to deposit the following amounts in an account paying 5% per year. What would the balance of the account be at the end of the third year? 300 500 700 1 2 3 4 5

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**Uneven Cash Flows: An Example (2)**

Suppose that you were to deposit the following amounts in an account paying 5% per year. What would the balance of the account be at the end of the third year? 300 500 700 1 2 3 4 5

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**Perpetuity A series of cash flows with infinite life. . . . . . . . C**

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**Perpetuity Example: Stock dividend valuation model**

stock price = present value of future dividends If a stock pays constant dividends of $3 per share beginning in year one, r = 10% , what is the price of the stock? P = 3 0.10 = $30

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**A Perpetuity That Grows @ g**

C C(1+g) C(1+g)2

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**A Perpetuity That Grows @ g**

Example: A stock pays dividends $3 in year 1, r=10% , then the dividends will 4% from year 2, what is the price of this stock? = $50 = $50

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