# Time Value of Money 1

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1 Time Value of Money 1 This topic introduces you to the analysis of trade-offs over time. Financial decisions involve costs and benefits that are spread over time. Financial decision makers in households and firms all have to evaluate whether investing money today is justified by the expected benefits in the future. They must therefore, compare the values of cash flows at different points in time. To do so requires a thorough understanding of the time value of money concepts and discounted cash flow techniques presented in this topic. This topic, therefore, shows you how to value cash flows. Understanding how to value cash flows is a fundamental skill that will be used throughout this unit and the remainder of your studies in finance. We first look at how to value a single cash flow and introduce the important ideas of compounding and discounting. Next, we consider how to value a stream of cash flows and discuss perpetuities and annuities. Finally, we explore how to value cash flows when interest rates have different compounding frequencies. At the end of this topic you will: Explain the difference between simple interest and compound interest Calculate the future value of a single cash flow Calculate the present value of a single cash flow Calculate the interest rate implied from present and future values Calculate future values and present values of investments with multiple cash flows Calculate loan repayments Explain how interest rates are quoted Calculate equivalent interest rates for different compounding periods Demonstrate the use of timelines in time value of money problems 1 These notes were prepared by Bernd Luedecke and Shane Magee. Macquarie University Time Value of Money.docx Page 1

2 1 Money has time value Would you rather receive a dollar today or receive a dollar in one year from now? Obviously, you would prefer to receive the dollar today. The assumption implicit in this common sense choice is that having the use of money for a period of time has value. The earlier receipt of an amount of money is more valuable than the receipt of the same amount of money in the future because you can deposit your money today into the bank and earn interest, and thereby get back more money in the future. We call the difference in value between money today and money in the future the time value of money. This is one of the most important concepts in finance. The time value of money concept refers to the fact that money received today is worth more than the receipt of the same amount some time in the future. The fact that money has time value means that it is meaningless to compare or combine cash flows that occur at different points in time. To compare or combine cash flows that occur at different points in time, you first need to value them at the same point in time. This means that arithmetic statements like C t +C s and C t C s make no sense. 2 following arithmetic statement does make sense: where: u ( t ) V u ( C t ) +V C u s V C is the value at date u of t u of C. s ( ) C and Vu( s) But the C is the value at date 2 In these arithmetic statements, t C and s C are two cash flows that that occur at dates t and s, where t and s are not the same date. For example, \$1m on the 1 st of January 2020 and \$1.5m on the 1 st of January Macquarie University Time Value of Money.docx Page 2

3 The important point to note here is that both cash flows are valued at the same point in time, u. In the following sections we will go into considerable detail analysing how to value cash flows that occur at different points in time. 2 Setting up the cash flows and the time line in a financial calculator It is important to fully understand the workings of the following five buttons on your financial calculator: N = number of payment periods I%YR = effective per period interest rate PV = present value PMT = recurring periodic payment FV = future value These five buttons allow you to enter and value cash flows using a conceptual time line. Note that the I%YR button interacts with the number of periods per year, P/YR, button. I recommend that you set the P/YR button to 1. Other buttons to understand are BEG and END. At this stage, you should set your financial calculator to END mode. Macquarie University Time Value of Money.docx Page 3

4 We will adopt the following conventions in setting up time lines: (a) Cash flows occur at the end of each time period (unless otherwise stated); (b) Cash outflows are entered as negative (-ve) values; (c) Cash inflows are entered as positive (+ve) values; (d) Today is represented by t=0; (e) The compounding period is the same as the payment period. The picture below should give you the idea. Figure 3.1 t=0 t=1 t=2 t=3 t=4 t=5 t=6 t=7 t=8 t=9 t=10 Time Macquarie University Time Value of Money.docx Page 4

5 3 Valuing a single cash flow We begin this section by calculating the future value of single cash flow. We then proceed to calculate the present value of single cash flow and review the relationship between future and present values. 3.1 Future value and compounding Future value is the amount of money a cash flow will grow to at some time in the future by earning interest at some interest rate. The process of calculating the future value of a cash flow is known as compounding. For example, suppose you deposit \$1,000 into a bank account for two years. If the effective annual interest rate is 10% the future value of that deposit at the end of year one is: \$1, = \$1,100, and the future value of the deposit at the end of year two: \$1, = \$1, = \$1,210. Notice that the future value of \$1,210 can be broken down into three components: The original deposit of \$1,000. The interest on this deposit of \$100 in year one and another \$100 in year two. The interest on the original deposit is called simple interest. In year two you also earn interest of \$10 on the \$100 interest you received in year one. The effect of earning interest on interest is known as compound interest. Macquarie University Time Value of Money.docx Page 5

6 In general, given a per period effective interest rate r, the future value, FV, in t periods of a cash flow C to be paid or received today, is 0 FV t = C 0 ( 1+ r) t. Notice that FV t depends upon (is a function of) C 0, r and t. If any of these three were to change, so would FV t. To think about: What happens to FV t as r? t? Example 1: Problem You deposit \$687, into a bank account for 7 years. The relevant effective annual interest rate is 5.5%. How much money will be in your account at the end of 7 years? Solution The future value of your deposit is: FV = \$687, = \$1,000,000 To solve this problem with your financial calculator you would do the following: Background settings: 1 P/YR, END MODE. Then input the following: N = 7, I%YR = 5.5, PV = -687,436.81, PMT = 0 and ask for FV. Answer: \$1,000,000 Notice that when using a financial calculator, we enter the amount invested as a negative. This is because this is an outflow of cash. Macquarie University Time Value of Money.docx Page 6

7 So in this example, we have a cash outflow of \$687, today and a cash inflow of \$1,000,000 7 years from today. Also notice that when using a financial calculator we enter the interest rate as a whole number rather than a decimal. 3.2 Present value and discounting The calculation of a present value is the reverse of the future value calculation. When calculating present values we are asking what amount would we need to invest today to have a certain amount in the future. The process of calculating the present value of a future cash flow is known as discounting. For example, suppose you want to have \$1,000 two years from now and the effective annual interest rate is 10%. The amount you must invest today is: \$1, = \$ Thus, if you invested \$ for two years at an effective annual interest rate of 10% it would grow to \$1,000 at the end of year two. In general, given a per period effective interest rate r, the present value, PV, of a cash flow C to be paid or received in t periods from now is: n C t PV = ( 1+ r). t Notice that PV depends upon (is a function of) C t, r and t. If any of these three were to change, so would PV. Macquarie University Time Value of Money.docx Page 7

8 To think about: What happens to PV as r? t? Example 2: Problem Someone promises to pay you \$1,000,000 7 years from now. 3 relevant effective annual interest rate is 5.5%. What is the present value of this promise? The Solution The present value is: PV = \$1,000, = \$687, To solve this problem with your financial calculator you would do the following: Background settings: 1 P/YR, END MODE. Then input the following: N = 7, I%YR = 5.5, PMT = 0, FV = 1,000,000 and ask for PV. Answer: \$687, Notice the PV is negative. Again, this reflects cash flow time line of this particular example. In order to receive \$1,000,000 in 7 years, you must pay something today. So inputting the positive cash flow of \$1,000,00 as the FV means the calculated PV must be an outflow. 3 Notice that this promise is a financial contract. Macquarie University Time Value of Money.docx Page 8

9 3.3 Some more thoughts In sections 3.1 and 3.2 we looked at calculating the future value and present value of cash flows. The essential ideas from these sections are captured in the formula relating future value, present value, the effective per period interest rate and the number of periods: FV t = PV ( 1+r) t Given any three of the variables in this formula, we can find the fourth. For example, the present value is calculated as: PV = FV t ( 1+r) t On many occasions in this unit (and indeed in other units) we will be interested in computing the effective per period interest rate from known PV s and FV s. Using either formula above, we can solve for the effective per period interest rate, r:! # r = FV t # PV " \$ & & % 1 t 1. Macquarie University Time Value of Money.docx Page 9

10 Example 3: Problem Using the answers from examples 1 and 2, let s show that the effective annual interest rate is 5.5%. Solution It should come as no surprise that the effective annual interest rate here is 5.5% as this is the interest rate used in both examples so let s show this!! We have r = \$1,000,000 7 # 1= 5.5% \$687, " \$ & % 1 To solve this problem with your financial calculator you would do the following: Background settings: 1 P/YR, END MODE. Then input the following: N = 7, PV = -687,436.81, PMT = 0, FV = 1,000,000 and ask for I%YR. Answer: 5.5 Macquarie University Time Value of Money.docx Page 10

11 3.4 Net present value and internal rate of return In the previous sections, we converted cash today and cash in the future using the effective per period interest rate. As long as we convert costs and benefits to the same point in time, we can make a decision. In practice, we prefer to measure values in terms of their present values since this is equivalent to cash today. When computing the value of a cost or benefit in terms of cash today, we are referring to its present value. Similarly, we define the net present value (NPV) of a project or investment as the difference between the present value of its benefits and the present value of its costs: NPV = PV benefits PV costs In this context, the benefits are cash inflows and the costs are cash outflows. If we compute the present value of all cash flows, we can also write this definition as NPV = PV all project cash flows Because NPV is expressed in terms of cash today it simplifies decision making. As long as we have captured all the costs and benefits of a project or investment, decisions with a positive NPV will increase wealth. We capture this this logic with the NPV decision rule: Accept a project/investment if its NPV is positive. Reject a project/investment if its NPV is negative. To summarise, NPV measures the dollar change in your wealth as a result of your choice. So accepting a positive NPV project/investment increases your wealth. Your wealth would decrease if you accepted a negative NPV project/investment. Hence, a rational individual would reject a project/investment that has a negative NPV. Macquarie University Time Value of Money.docx Page 11

12 Example 4: Problem Suppose a \$100,000 savings bond maturing in 5 years is selling for \$75,000. Your next best alternative for investing is a bank account offering an effective annual interest rate of 8%. Is the savings bond a good investment? Solution The initial investment of the savings bond is \$75,000. This amount is paid today so there is no discounting to be done here. The present value of the cash flows generated by the savings bond is simply the present value of \$100,000 to be received 5 years from today. The relevant interest rate to discount the \$100,000 is the rate that the money could earn if it were not invested in the bond. In general, for the NPV calculation of any investment, we use the opportunity cost of capital as the interest rate. The opportunity cost of capital is simply the rate we could earn somewhere else at the same level of risk as the investment under evaluation. In this example, the opportunity cost of capital of investing in the savings bond is the rate we could earn if we put our money in the bank instead 8% per year in this case. So in this case the NPV is: NPV = \$75,000 + \$100, = \$75,000 +\$68, = \$6, Notice that the present value of the inflow is less than the initial investment. In other words, the NPV of this investment is negative. We therefore conclude that investing in this savings bond is not worthwhile. Macquarie University Time Value of Money.docx Page 12

13 Another decision rule, which in many circumstances is equivalent to the NPV rule is: Accept an investment if its return is greater than the opportunity cost of capital This is known as the internal rate of return (IRR). The IRR is the discount rate that makes the present value of the cash inflows equal to the present value of the cash outflows. In other words, the IRR is the discount rate at which the NPV is zero. Thus, if the rate at which the NPV is zero (the IRR) is greater than the opportunity cost of capital, then we know that the NPV at the opportunity cost of capital must be positive. Example 5: Problem Calculate the IRR for the savings bond in example 4. Solution We want to find the discount rate that solves the following formula: \$75,000 = \$100,000 ( 1+r) 5 The IRR in this case is 1! \$100,000\$ 5 # & 1 = 5.92% " \$75,000 % You could also find the IRR using your financial calculator like we did in section We would do the following: Background settings: 1 P/YR, END MODE. Then input the following: N = 5, PV = -75,000, PMT = 0, FV = 100,000 and ask for I%YR. Answer: 5.92 Macquarie University Time Value of Money.docx Page 13

14 Since the IRR is less than the opportunity cost of capital of 8% it is not worthwhile investing in this savings bond. 4 Valuing a stream of cash flows Many financial instruments have multiple cash flows that occur at different points in time. In section 3.3 we looked at valuing single cash flows. Now we show how to value a stream of cash flows. Consider a stream of cash flows: C 0 today, C 1 at period 1, C 2 at period 2, and so on up to C T at period T. The present value of this cash flow stream is: PV = C 0 + C 1 1+r C T ( ) + C 2 ( 1+r) ( 1+r) = T T t=0 C t ( 1+r) t This is known as the discounted cash flow (DCF) formula. Notice that the present value of a stream of cash flows is just the sum of the present values of each cash flow. 4 This approach allows you to value any cash flow stream, regardless of whether the cash flows are equal or unequal. In the next few sections we learn shortcuts for valuing a stream of equal cash flows Note that ( 1+ r ) = 1, so that = ( ) C 1 + r C. 0 0 Macquarie University Time Value of Money.docx Page 14

15 4.1 Perpetuities A stream of equal cash flows that go on forever is called a perpetuity. A financial instrument which has this cash flow pattern is called a consol. The British government issued such instruments until December An investor purchasing a consol is entitled to receive interest from the British government every year forever. Since these instruments never mature they are still held by investors, albeit infrequently traded. We could value a perpetuity by applying the present value formula PV = ( C 1+ r) + C 1+ r C ( ) + 2 ( 1+ r) + = 3 C. t=1 1+ r ( ) t However, this approach would take you forever literally! Fortunately there is a shortcut that can be used to value a perpetuity. The present value, PV, of a perpetuity that pays a cash flow C at the end of every period and with an effective per period interest rate r is: PV C = r The present value of a perpetuity is an amount of money that, if you had it today, would enable you to create the same set of cash flows as a perpetuity. For example, suppose you invest an amount P in a bank account. At the end of every period you can withdraw the interest you have earned, C= r P, leaving the principal, P in the bank. The present value of receiving C in perpetuity is therefore the original principal that was invested, P = C. Of course, we would have to assume that you can r do this forever! Macquarie University Time Value of Money.docx Page 15

16 Example 6: Problem What is the present value of \$5,000 to be received at the end of every year in perpetuity if the relevant annual effective interest rate is 5%? Solution The present value is: PV = \$5, = \$100,000 Example 7: Problem If somebody gave you the amount, which is your answer to Example 6, how would you convert it back into a perpetuity? (assume that the 5% annual effective interest rate is available to you). Solution You could convert this into a perpetuity by doing the following: Today: Deposit \$100,000 for one year at 5.00% In one year: Receive back the deposit of \$100,000 plus \$5,000 interest (5% \$100,000) Reinvest the \$100,000 for another year at 5.00% Spend the \$5,000 You would do this forever! Macquarie University Time Value of Money.docx Page 16

17 4.2 Growing perpetuities Suppose the cash flows on a perpetuity grow at rate g. The first cash flow is C 1 and rate g applies to every cash flow after that so that after t periods the cash flow is C t = C 1 1+ g series of growing cash flows is: C 1 PV r g ( ) t 1. The present value of this infinite = ( r> g) where: PV is the present value C is the first cash flow, occurring one period from today 1 r is the effective per period interest rate g is the growth rate of the cash flows. Notice that if g = 0 the above valuation formula collapses to that for the previous "vanilla" perpetuity. Perpetuities and growing perpetuities may seem a bit strange to you. You will see the power of these valuation techniques when valuing shares in this unit. Macquarie University Time Value of Money.docx Page 17

18 4.3 Annuities An annuity is a finite stream of equal cash flows paid at regular intervals. Annuities are amongst the most common kinds of financial instruments. For example, many car loans, leases, pensions, and bonds are annuities. We could value a t-period annuity by calculating the present value of each cash flow and finding the total. There is also a shortcut that can be used to value a t-period annuity. The present value, PV, of an annuity that pays a cash flow C at the end of the period for each of t periods and with an effective per period interest rate r is: PV = C 1 r 1 r 1 + r! The expression in the square brackets shows the present value of \$1 to be received at the end of each of the t periods. It is known as the t-period annuity factor. A t-period annuity can be viewed as equivalent to a perpetuity with the first payment made at the end of the first period less another perpetuity whose first payment is made at the end of period t+1. The immediate perpetuity net of the delayed perpetuity provides exactly t-periods. Example 8: Problem Someone promises to pay you \$1,000,000 every year (at the end of the year) for the next 15 years. The first payment will be one year from today. The relevant effective annual interest rate is 7.0%. What does the time line look like for this problem? What would you pay, today, for this promise? Macquarie University Time Value of Money.docx Page 18

19 Solution There will be cash inflows of \$1,000,000 at the end of every year from year 1 to year 15. You would pay the present value of this stream of cash flows. The present value is: PV = \$1,000, !" = \$9,107, You could also find the present value using your financial calculator. We would do the following: Background settings: 1 P/YR, END MODE. Then input the following: N = 15, I%YR = 7, PMT = 1,000,000, FV = 0 and ask for PV. Answer: \$9,107, Example 9: Problem Show that the answer in Example 8 is the same as the difference between the present value of the following two perpetuities. Perpetuity 1 pays \$1,000,000 at the end every year with the first payment made in 1-year. Perpetuity 2 pays \$1,000,000 at the end every year with the first payment made in 16-years. The relevant annual effective interest rate is 7.0%. Solution PV of perpetuity 1= \$1,000, PV of perpetuity 2 = \$1,000, = \$14,285,714.29! \$ # 1 & #( ) 15 & = \$5,177, " % PV of perpetuity 1 PV of perpetuity 2 = \$14,285, \$5,177, = \$9,107, Macquarie University Time Value of Money.docx Page 19

20 Example 10: Problem How would the answer in Example 8 change if the payments start today? Solution There are still 15 cash flows. The first cash flow is now paid at the beginning of the first year and the last cash flow is now paid at the beginning of year 15. In other words the first cash flow is paid today and the last cash flow is paid at the end of year 14. The present value is thus, \$1,000,000 (today s value of the first payment) plus the present value of a 14-year annuity. PV = \$1,000,000 + \$1,000, !" = \$9,745, If you are using the time value of money functions on your financial calculator you could change the background setting to end mode to calculate the present value. Here s how you do it with a financial calculator. Background settings: 1 P/YR, BEG MODE. Then input the following: N = 15, I%YR = 7, PMT = 1,000,000, FV = 0 and ask for PV. Answer: \$9,745, Macquarie University Time Value of Money.docx Page 20

21 Example 11: Problem How would the answer in Example 8 change if the payments start at the end of year 6? Solution Again there are still 15 cash flows. The first cash flow is now paid at the end of year 6 and the last cash flow is now paid at the end of year 20. Notice that when we calculated the present value of the annuity with the first payment at the end of year 1 in Example 8, that value was today s value on a timeline. In other words, the present value calculated from the annuity formula or time value of money functions on your financial calculator is the value one period before the first payment. The first step is to calculate the value of the 15-year annuity at the end of year 5 (i.e., beginning of year 6). We already did this calculation in the solution to Example 8. The value was \$9,107, The next step is to discount that value back to today that is, we discount by 5 years. So today s value is PV = \$9,107, ! = \$6,493, Macquarie University Time Value of Money.docx Page 21

22 We can obtain the future value of a t-period annuity directly from the present value of a t-period annuity. After obtaining the present value of the annuity we then multiply it by 1 + r! to obtain the future value. Specifically, the future value, FV, of an annuity that pays a cash flow C at the end of every period for t-periods with an effective per period interest rate r is: FV of t- period annuity = PV of t- period annuity 1 + r! = C 1 r 1 r 1 + r! 1 + r! = C 1 + r! 1 r Likewise, if we know the future value of a t-period annuity then we can calculate the present value directly from the future value PV of t- period annuity = FV of t- period annuity 1 + r! Macquarie University Time Value of Money.docx Page 22

23 Example 12: Problem Using the same data as in Example 8, what would that series of payments accumulate to at the end of year 15? Solution The future value of this annuity is the future value of the present value obtained from the solution to Example 8 FV = \$9,107, !" = \$25,129, We can check this with our annuity future value formula above or with a financial calculator. FV = \$1,000, !" = \$25,129, Using a financial calculator we have: Background settings: 1 P/YR, END MODE. Then input the following: N = 15, I%YR = 7, PMT = 1,000,000, PV = 0 and ask for FV. Answer: \$25,129, Macquarie University Time Value of Money.docx Page 23

24 4.4 Growing annuities Suppose the cash flows on a t-period annuity grow at rate g. The first cash flow is C 1 and rate g applies to every cash flow after that so that after t periods the cash flow is CF t = C 1 1+ g finite series of growing cash flows is: ( ) t 1. The present value of this PV = C 1 1 # t # 1+ g & & % 1 ( r g % % \$ 1+r ( \$ ' ( ' ( r> g) where: PV is the present value C is the first cash flow, occurring one payment date from 1 today r is the per period effective interest rate g is the growth rate of the cash flows N is the number of periods. Notice that if g = 0 the above valuation formula collapses to that for the previous vanilla annuity. Growing annuities aren't all that common. They sometimes arise in the context of valuing mineral extraction projects where the price for the extracted ore, or the costs of key inputs, is assumed to grow at some conjectured rate. Macquarie University Time Value of Money.docx Page 24

25 5 Different compounding periods Here's yet another consequence of the time value of money: It matters, from the point of view of value, when and how often you receive, or have to pay, an amount of cash. Time is money!! It is important to remember this in the context of interest rates and how they are quoted. Every interest rate quoted has a compounding frequency associated with it. If this is not stated explicitly confusion can (and often does) arise about exactly what that interest rate means. For example, imagine a bank pays a rate of 10% per annum compounding semi-annually. This means that interest is paid twice per year. A deposit of \$1,000 in the bank would be worth 1, \$1,050 \$1, = 1, ( + ) = after six months and ( ) at the end of year. The future value of the deposit in one year can be written as! \$1, # 2 " \$ & % 2 = \$1, = 1, Now, if you deposited \$1,000 at an effective annual interest rate of 10% \$1, = \$1,100 at the end of the the deposit would be worth ( ) year. Notice that the future value at the end of the year is greater with semi-annual compounding than annual compounding. With semiannual compounding, interest is paid twice a year. It s important to remember that the interest earned in the first six months also earns interest. This is the interest on interest effect, which is what the notion of compounding is all about. Because \$1, = \$1, = 1,102.50, a rate of 10% per annum compounding semi-annually is equivalent to an effective annual rate of 10.25%. That is, both interest rates are equivalent since they generate the same future value. Hence, a rational individual would be indifferent to Macquarie University Time Value of Money.docx Page 25

26 an interest rate of 10% per annum compounding semi-annually or an effective annual interest rate of 10.25%. In general, suppose you are quoted an annual interest rate of r! compounding m times per year. For example, m=12 denotes monthly compounding, m=4 denotes quarterly compounding, etc. The effective annual interest rate, compounding only once per year, is EAR in the following expression: 1 + EAR = 1 +!!!!. The left hand side of this formula is the future value of investing \$1 for a year at the effective annual rate. The right had side is the future value of investing \$1 for a year at a per annum interest rate of r! compounding m times per year. We can then calculate the effective annual rate from the above formula: EAR = 1 +!!!! 1. For example, an interest rate of 9% per annum compounding quarterly is equivalent to an effective annual interest rate of 1 +!.!"! 1 = or %. Notice that the effective annual rate is numerically larger than the 9% per annum compounding quarterly interest rate. This is because of the interest on interest effect as those little payments of within-the-year interest themselves earn interest.! Why are these two interest rates equivalent? Because they generate the same future value. In other words, ! = 1 + EAR = Macquarie University Time Value of Money.docx Page 26

27 The per annum semi-annual, quarterly, monthly and daily compounding interest rates that are all equivalent to the same annual effective rate, EAR, are given by the following set of equations: 1+ a = = = = 2 r 1+ 2 (m = 2, that is, semi-annually) 2 4 r 1+ 4 (m = 4, that is, quarterly) 4 12 r12 + (m = 12, that is, monthly) r + (m = 365, that is, daily). 5 These equations clearly show the interplay between the size of the within-the-year interest payments (larger, smaller) and how often they are being paid (less frequently, more frequently) to yield the same annual effective rate, a. You should see a pattern in these relationships, especially once you recognise that: 1 r 1+EAR = (m = 1, that is, effective annual). 5 A 365- day year has been assumed here. Some markets operate under other conventions. Macquarie University Time Value of Money.docx Page 27

28 Example 13: Problem You are quoted an interest rate of 12% per annum compounding semiannually. What is the equivalent effective annual interest rate? What is the equivalent per annum interest rate compounding monthly? Solution The effective annual rate is: EAR = 1 +!.!"!! 1 = 12.36%. We can now compute the per annum rate compounding monthly from the effective annual rate. To do that, we equate the future value of investing \$1 for a year at the effective annual to the future value of investing \$1 for a year at the per annum rate compounding monthly, r!" and solve for r!". In other words, = 1 + r!" 12!" To solve for r!", we first raise both sides of the above equation by! 1 +!!"!" That is, by itself.!" to get !!" = 1 + r!" 12!"!!" = 1 + r!" 12 Solving for r!", we have =!!" = which is!" the effective per month rate and r!" = = %. Notice that multiplying the effective per month rate by 12 gives us the per annum rate. Macquarie University Time Value of Money.docx Page 28

29 We could have also calculated the equivalent per annum rate compounding monthly directly from the per annum rate compounding semi-annually. That is, we solve for r!" in the following equation ! = 1 + r!" 12!" Try it to see that you get the same answer! In practical terms the compounding frequency, m, tells you two key things about how to use that interest rate, r!, in present value and future value calculations: (1) always use the rate in its effective per period form. Where the r effective per period interest rate r is m m ; and (2) measure time not in years (unless m=1) but in the periods specified by m. This is particularly important when calculating present values and future values of annuities and perpetuities. These next two examples explore these ideas further. Macquarie University Time Value of Money.docx Page 29

30 Example 14: Problem What is the present value of a \$1,000 to be received in 5 years if the relevant interest rate is 12% per annum compounding monthly? Solution In this case, we could first convert the per annum rate compounding monthly to its equivalent effective annual rate or we could just calculate the present value directly from the monthly compounding rate. Let s take the latter approach. The number of monthly periods here is 60 (5 years 12 months). So the present value is \$",!!!!" = \$ Example 15:!!.!"!" Problem Someone promises to pay you \$1,000 every month (at the end of the year) for the next 12 months. The first payment will be one month from today. The relevant effective annual interest rate is 12.36%. What is the present value of this annuity? Solution Before using the annuity formula or the time value of money functions on your financial calculator, we must first ensure the discount rate period matches the periodicity of the cash flows. In other words, we must convert the effective annual rate of 12.36% to its equivalent effective per month rate. From Example 13, we know that the effective per month rate that is equivalent to the effective annual rate of 12.36% is %. Macquarie University Time Value of Money.docx Page 30

31 Now we can calculate the present value of this annuity. There are 12 monthly periods. So the present value of this annuity is PV = \$1, !" = \$11, You could also find the present value using your financial calculator. We would do the following: Background settings: 1 P/YR, END MODE. Then input the following: N = 12, I%YR = , PMT = 1,000, FV = 0 and ask for PV. Answer: \$11, Previously we went as far as daily compounding. Suppose we keep pushing this notion and consider more and more frequent compounding. We could go to hourly, per minute, per second, etc. In the limit, we are thinking about really small (infinitesimally small) amounts of interest being paid really, really often (in continuous time). The interest rate that pays in this way is called a continuously compounding interest rate. If compounding is continuous, then we can use the exponential function, e x, to compute future values. With continuous compounding, the future r value of investing \$1 for one year is e c, where e is a constant approximately equal to , and r c is the per annum continuously compounding interest rate. If we invest \$1 for one year at the continuously compounding interest rate that is equivalent to the effective annual rate, EAR, then the future value of that \$1 is given by: e r c = 1+EAR. Macquarie University Time Value of Money.docx Page 31

32 If we know the future value of the \$1 we invested, then we can compute the continuously compounding interest rate by using the natural logarithm, ln. Applying the natural logarithm to both sides of the above equation, we have: 6 r c = ln( 1+EAR). In general, the per annum continuously compounding interest rate that is equivalent to a quoted per annum interest rate r! compounding m times per year, is r c in the following: 7 rm rm rc = ln( 1+ a) = ln 1+ mln 1 m = + m. m Example 16: Problem What is the per annum continuously compounded interest rate that is equivalent to 8% per annum compounding daily? (Assume a 365-day year). Solution r! = ln !"# = % 6 x This uses the algebraic fact that: ln ( e ) = x. 7 x This uses the algebraic fact that: ( y ) = x ( y) ln ln. Macquarie University Time Value of Money.docx Page 32

33 Continuously compounding interest rates may seem a little weird to you. They are(!). But they play an extremely important role in finance, especially in options theory. They are also used extensively by empirical researchers and practising financial analysts because of a property, observed again and again in data, that they are much more symmetrically distributed than are the original once-per-period rates. Unfortunately we rarely observe continuously compounding rates in practice. They are really just another change of payment frequency, m, which we played around with a few pages ago. That is, any given effective annual interest rate, a (for which m=1), can be equivalently re-expressed with a different payment frequency (m=2, m=12, m=365, etc.). The equivalent continuously compounding rate has m and is calculated using the ln( ) function. Notice that, for a given effective annual effective rate, the continuously compounding rate, r c, will be numerically the smallest since it has the greatest interest on interest effect. Example 17: Problem Complete the following table with equivalent rates. Annual rate m Frequency Annually Semi-annually Quarterly 12% Monthly Daily Continuously Macquarie University Time Value of Money.docx Page 33

34 Solution Here is the solution to this problem. I invite you to calculate the equivalent rates. Annual rate m Frequency % 1 Annually % 2 Semi-annually % 4 Quarterly 12% 12 Monthly % 365 Daily % Continuously Observe that the table was seeded with a single number. All the other rates you calculated are equivalent, in an annual effective sense, to that original rate. Macquarie University Time Value of Money.docx Page 34

35 Continuously compounding discount factors and future value factors look different from their per period effective cousins. Suppose r c is a per annum continuously compounding interest rate. Then the present value, PV, of a cash flow C T to be paid or received T years from now is: PV C e rt c =. T Similarly, the future value, FV, in T years time of a cash flow C 0 to be paid or received today is: c FV C e rt =. 0 Notice that when we calculate present values and future values with continuously compounding interest rates we measure time in years (or fractional years). Example 18: Problem What is today s value of \$10,000,000 flowing in 3½ years time if the relevant interest rate is 4.75% per annum continuously compounded? Convert this rate to its equivalent effective annual rate and show that the answer is the same. Solution Using continuous compounding we have: PV = \$10,000,000e = \$8,468, Macquarie University Time Value of Money.docx Page 35

36 We now calculate the equivalent effective annual rate by equating future values in one year: e!.!"#\$ = 1 + EAR. The EAR is therefore e!.!"#\$ 1 = %. When calculating the present value using the effective annual rate we get: PV = \$"#,!!!,!!! = \$8,468,344.99, which is the same as when we used!.!"#\$"\$!.! the continuously compounded rate. Example 19: Problem What is the future value of \$5,000,000 (a today amount) in 7¼ years time if the relevant interest rate is 2.50% per annum continuously compounded? Convert this rate to its equivalent effective per quarter rate and show that the answer is the same. Solution Using continuous compounding we have: FV = \$5,000,000e = \$5,993, We now calculate the equivalent per annum rate compounding quarterly by equating future values in one year: e!.!"#\$ = 1 + EAR. The EAR is therefore e!.!"#\$ 1 = %. When calculating the present value using the effective annual rate we get: PV = \$"#,!!!,!!! = \$8,468,344.99, which is the same as when we used!.!"#\$"\$!.! the continuously compounded discount rate Using continuous compounding: FV = \$5,000,000 e = \$5,993, r4 We have 4ln 1+ = r or ln 1+ = 4 4 Macquarie University Time Value of Money.docx Page 36

37 After applying the exponential function to both sides of the above equation, we have: 1 4 r / 4 + = e Therefore, r ( e ) 4 = 4 1 = %p.a.(quarterly) Using discrete compounding: ( ) FV = \$5, 000, = \$5,993, Macquarie University Time Value of Money.docx Page 37

38 6 Useful Excel functions While time value of money calculations can be done with a financial calculator, it is often much more convenient to do them using a spreadsheet program. Spreadsheet programs such as Excel have built in functions to solve a range of time value of money problems problems. You can find these functions by pressing fx on the Excel toolbar and looking under the heading Financial. When you click on the function that you wish to use, Excel will ask you for the required inputs. You will find a Help facility at the bottom of the function box with an example of how it is used. Here are some examples of useful Excel functions to solve time value of money problems. Note that for all of these functions, cash outflows are entered as negative values and cash inflows are entered as positive values. Interest rates should be entered as a decimal value. FV: Calculates the future value of either a single cash flow or annuity, given the present value, effective per period interest rate, number of periods and per period payment. PV: Calculates the present value of either a single cash flow or annuity, given the effective per period interest rate, number of periods, per period payment and future value. RATE: Calculates the effective per period interest rate, given the present value, future value, number of periods and per period payment. PMT: Calculates the payments per period for an annuity, given the present value, future value, effective per period interest rate and number of periods. NPER: Calculates the number of periods, given the present value, future value, per period payment and effective per period interest rate. Macquarie University Time Value of Money.docx Page 38

39 EFFECT: Calculates the effective annual interest rate, given a per annum interest rate compounding m times per year. NOMINAL: Calculates the per annum interest rate compounding m times per year, given the effective annual interest rate and the compounding periods per year. IRR: Calculates the internal rate of return of return of a series of cash flows. Excel s IRR function has the format, IRR(values, guess), where values is the range containing the cash flows and guess is an optional starting guess where Excel begins its search for an IRR. There are three things to note about Excel s IRR function: 1) the values given to the IRR function should include all cash flows, including the cash flow at date 0; 2) The IRR function ignores the period associated with any blank cells. It is therefore recommended to enter the value 0 for periods with no cash flows; and 3) in some cases the IRR function may fail to find a solution, or may give a different answer, depending on the initial guess. NPV: Calculates the present value of a stream of cash flows, given the effective per period interest rate. There are two warnings with Excel s NPV function: 1) The NPV function calculates the present value of the cash flows at date 1. Therefore, if a project s first cash flow occurs at date 0, we must add it separately; and 2) The NPV function ignores the period associated with any blank cells. It is therefore recommended to enter the value 0 for periods with no cash flows. Macquarie University Time Value of Money.docx Page 39

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