INTEREST RATES AND PRESENT VALUE
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1 INTEREST RATES AND PRESENT VALUE CHAPTER 7
2 INTEREST RATES 2
3 INTEREST RATES We have thought about people trading fish and hamburgers lets think about a different type of trade 2
4 INTEREST RATES We have thought about people trading fish and hamburgers lets think about a different type of trade Joe would like to trade coconuts that will be ripe tomorrow in order to get ripe coconuts today 2
5 INTEREST RATES We have thought about people trading fish and hamburgers lets think about a different type of trade Joe would like to trade coconuts that will be ripe tomorrow in order to get ripe coconuts today Bill is willing to trade some of the coconuts he has today in order to get coconuts tomorrow. 2
6 INTEREST RATES We have thought about people trading fish and hamburgers lets think about a different type of trade Joe would like to trade coconuts that will be ripe tomorrow in order to get ripe coconuts today Bill is willing to trade some of the coconuts he has today in order to get coconuts tomorrow. At what rate will they trade in a competitive market? 2
7 INTEREST RATES We have thought about people trading fish and hamburgers lets think about a different type of trade Joe would like to trade coconuts that will be ripe tomorrow in order to get ripe coconuts today Bill is willing to trade some of the coconuts he has today in order to get coconuts tomorrow. At what rate will they trade in a competitive market? For quite a few reasons we think if Bill is going to give up 10 coconuts today he is going to want more than 10 coconuts back tomorrow 2
8 INTEREST RATES We have thought about people trading fish and hamburgers lets think about a different type of trade Joe would like to trade coconuts that will be ripe tomorrow in order to get ripe coconuts today Bill is willing to trade some of the coconuts he has today in order to get coconuts tomorrow. At what rate will they trade in a competitive market? For quite a few reasons we think if Bill is going to give up 10 coconuts today he is going to want more than 10 coconuts back tomorrow This is called interest 2
9 WHY DO WE WANT MORE TOMORROW? 3
10 WHY DO WE WANT MORE TOMORROW? People are impatient-all else equal I would rather have a candy bar today than wait for it until tommorow 3
11 WHY DO WE WANT MORE TOMORROW? People are impatient-all else equal I would rather have a candy bar today than wait for it until tommorow There is some risk that Joe will die or renege on his promise (the larger the risk of this the more interest we will want) 3
12 WHY DO WE WANT MORE TOMORROW? People are impatient-all else equal I would rather have a candy bar today than wait for it until tommorow There is some risk that Joe will die or renege on his promise (the larger the risk of this the more interest we will want) I might be able to do something useful with the coconuts (or money) in the meantime Use the coconuts to build a shelter that I can live in (and if this is money I could buy a house today, live in it, and then sell the house tomorrow) Use it to buy an ice cream truck, make money selling ice cream, and then sell the ice cream truck at the end of the day Or if some emergency comes up and I need the money right away, I don t have it and need to wait until I get paid back 3
13 INTEREST RATE 4
14 INTEREST RATE The interest rate is the percentage, usually expressed in annual terms, of a balance that is paid by a borrower to a lender that is in addition to the original amount borrowed or lent. 4
15 INTEREST RATE The interest rate is the percentage, usually expressed in annual terms, of a balance that is paid by a borrower to a lender that is in addition to the original amount borrowed or lent. 4
16 INTEREST RATE The interest rate is the percentage, usually expressed in annual terms, of a balance that is paid by a borrower to a lender that is in addition to the original amount borrowed or lent. If I trade 100 coconuts today for 108 coconuts next year, the interest rate is 8% 4
17 INTEREST RATE The interest rate is the percentage, usually expressed in annual terms, of a balance that is paid by a borrower to a lender that is in addition to the original amount borrowed or lent. If I trade 100 coconuts today for 108 coconuts next year, the interest rate is 8% As a practical matter it doesn t usually work this way: Banks act as intermediaries Joe borrows coconuts from the bank Bill saves his coconuts in the bank While they never actually meet each other-joe is essentially borrowing from Bill 4
18 NOMINAL VS. REAL INTEREST RATES 5
19 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest 5
20 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption 5
21 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption As an example suppose the inflation rate is 10% and the nominal interest rate is 10% 5
22 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption As an example suppose the inflation rate is 10% and the nominal interest rate is 10% I put $100 into my account this year (2011) 5
23 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption As an example suppose the inflation rate is 10% and the nominal interest rate is 10% I put $100 into my account this year (2011) I get $110 next year (2012) 5
24 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption As an example suppose the inflation rate is 10% and the nominal interest rate is 10% I put $100 into my account this year (2011) I get $110 next year (2012) However, that $110 in 2012 is worth the same amount as $100 in 2011, so I didn t really earn any interest 5
25 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption As an example suppose the inflation rate is 10% and the nominal interest rate is 10% I put $100 into my account this year (2011) I get $110 next year (2012) However, that $110 in 2012 is worth the same amount as $100 in 2011, so I didn t really earn any interest In that case the real interest rate would be 0 5
26 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption As an example suppose the inflation rate is 10% and the nominal interest rate is 10% I put $100 into my account this year (2011) I get $110 next year (2012) However, that $110 in 2012 is worth the same amount as $100 in 2011, so I didn t really earn any interest In that case the real interest rate would be 0 I would probably want to spend that $100 now before inflation erodes its value 5
27 NOMINAL VS. REAL INTEREST RATES Nominal Interest Rate: the advertised rate of interest Real Interest Rate: the rate of interest after inflation expectations are accounted for; the compensation for waiting on consumption As an example suppose the inflation rate is 10% and the nominal interest rate is 10% I put $100 into my account this year (2011) I get $110 next year (2012) However, that $110 in 2012 is worth the same amount as $100 in 2011, so I didn t really earn any interest In that case the real interest rate would be 0 I would probably want to spend that $100 now before inflation erodes its value In economics we usually care about the real interest rate 5
28 PRESENT VALUE 6
29 PRESENT VALUE Present Value is the interest adjusted value of future payment streams. 6
30 PRESENT VALUE Present Value is the interest adjusted value of future payment streams. To think of this consider two different scenarios: 1. I pay you $300 this year 2. I pay you $100 this year, $100 in 2012, and $100 in
31 PRESENT VALUE Present Value is the interest adjusted value of future payment streams. To think of this consider two different scenarios: 1. I pay you $300 this year 2. I pay you $100 this year, $100 in 2012, and $100 in 2013 The interest rate is 5% 6
32 PRESENT VALUE Present Value is the interest adjusted value of future payment streams. To think of this consider two different scenarios: 1. I pay you $300 this year 2. I pay you $100 this year, $100 in 2012, and $100 in 2013 The interest rate is 5% Are these the same? 6
33 PRESENT VALUE Present Value is the interest adjusted value of future payment streams. To think of this consider two different scenarios: 1. I pay you $300 this year 2. I pay you $100 this year, $100 in 2012, and $100 in 2013 The interest rate is 5% Are these the same? Think about it this way: 1. I get my $300 now, spend $100 and save $ Next year I have $210 in the bank, I spend $110 and save $ In 2013 I now have $105 to spend 6
34 7
35 Obviously I prefer the $300 today. 7
36 Obviously I prefer the $300 today. This is because the present value of a stream of $100 for three years is less than $300. 7
37 Obviously I prefer the $300 today. This is because the present value of a stream of $100 for three years is less than $300. Well how much is it exactly? 7
38 Obviously I prefer the $300 today. This is because the present value of a stream of $100 for three years is less than $300. Well how much is it exactly? The present value of the first $100 today is $100 7
39 Obviously I prefer the $300 today. This is because the present value of a stream of $100 for three years is less than $300. Well how much is it exactly? The present value of the first $100 today is $100 The present value of $100 next year must solve the following equation (r is the interest rate) 7
40 Obviously I prefer the $300 today. This is because the present value of a stream of $100 for three years is less than $300. Well how much is it exactly? The present value of the first $100 today is $100 The present value of $100 next year must solve the following equation (r is the interest rate) PV(1 + r) = $100 That is, if I put PV in the bank today, I will have $100 in the bank tomorrow 7
41 8
42 So PV = $100 (1 + r) = $100 (1.05) = $
43 So PV = $100 (1 + r) = $100 (1.05) = $95.23 Now what about the present value of $100 in 2012? To see where this comes from suppose I put $Y into the bank in This would be give me $Y(1+r) in 2012 If I just kept it in the bank I would get $Y(1+r)(1+r) in 2013 Thus the present value of $100 in 2013 is: 8
44 So PV = $100 (1 + r) = $100 (1.05) = $95.23 Now what about the present value of $100 in 2012? To see where this comes from suppose I put $Y into the bank in This would be give me $Y(1+r) in 2012 If I just kept it in the bank I would get $Y(1+r)(1+r) in 2013 Thus the present value of $100 in 2013 is: PV = $100 (1 + r) 2 = $100 (1.05) 2 = $
45 And the value of the stream of $100 for 3 years is worth: $100 + $100 (1 + r) + $100 = $100 + $ $90.70 (1 + r) 2 = More generally the present value of a payment $Y n years from now is worth today $Y (1 + r) n Rather than doing more calculations lets look at what this means 9
46 THE AMOUNT PAYABLE FOR EVERY DOLLAR BORROWED (FOR SEVERAL INTEREST RATES AND LOAN DURATIONS) Interest rate -> Years 20% 10% 5% 2% 1%
47 EXAMPLES FROM THIS TABLE If you borrow $1 and promise to pay it back in 5 years at 5% interest you will owe $1.28 which is the original $1 plus 28 cents in interest. If you borrow $1 and promise to pay it back in 30 years at 20% interest you will owe $ which is the original $1 plus $ in interest. 11
48 BUSINESS VENTURE Suppose you have the following business venture: Invest $100 into the venture for 5 years receive $100 in proceeds starting in year 6 and lasting for 7 years Is this a good investment? It depends on the interest rate 12
49 A MULTIPLE YEAR 5% Year Cost Benefit PV PV
50 A MULTIPLE YEAR 5% Year Cost Benefit PV PV
51 A MULTIPLE YEAR 5% Year Cost Benefit PV PV This is a good deal
52 A MULTIPLE YEAR 8% Year Cost Benefit PV PV
53 A MULTIPLE YEAR 8% Year Cost Benefit PV PV
54 A MULTIPLE YEAR 8% Year Cost Benefit PV PV Not a good deal at this interest rate
55 INTERNAL RATE OF RETURN 15
56 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment 15
57 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment At 8% (or more) this is a bad investment 15
58 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment At 8% (or more) this is a bad investment 15
59 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment At 8% (or more) this is a bad investment Internal rate of return : The interest rate where the present value of costs and benefits are equal. 15
60 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment At 8% (or more) this is a bad investment Internal rate of return : The interest rate where the present value of costs and benefits are equal. 15
61 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment At 8% (or more) this is a bad investment Internal rate of return : The interest rate where the present value of costs and benefits are equal. If my interest rate is lower than the internal rate, I should do it 15
62 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment At 8% (or more) this is a bad investment Internal rate of return : The interest rate where the present value of costs and benefits are equal. If my interest rate is lower than the internal rate, I should do it 15
63 INTERNAL RATE OF RETURN At 5% (or less) this was a good investment At 8% (or more) this is a bad investment Internal rate of return : The interest rate where the present value of costs and benefits are equal. If my interest rate is lower than the internal rate, I should do it If it is higher than the internal rate, I should not do it 15
64 MORTGAGES, CAR PAYMENTS, ETC. 16
65 MORTGAGES, CAR PAYMENTS, ETC. Mortgages are loans taken out to buy homes. Typically you borrow a large sum of money and promise to pay it back in even amounts each month for 10, 15, or 30 years. 16
66 MORTGAGES, CAR PAYMENTS, ETC. Mortgages are loans taken out to buy homes. Typically you borrow a large sum of money and promise to pay it back in even amounts each month for 10, 15, or 30 years. Car loans are similar to mortgages in that you borrow a large sum but the loan duration is usually two to six years. 16
67 MORTGAGES, CAR PAYMENTS, ETC. Mortgages are loans taken out to buy homes. Typically you borrow a large sum of money and promise to pay it back in even amounts each month for 10, 15, or 30 years. Car loans are similar to mortgages in that you borrow a large sum but the loan duration is usually two to six years. How does the financing department figure out the monthly payment at a 2.9% interest for a $32,000 car? 16
68 MORTGAGES, CAR PAYMENTS, ETC. Mortgages are loans taken out to buy homes. Typically you borrow a large sum of money and promise to pay it back in even amounts each month for 10, 15, or 30 years. Car loans are similar to mortgages in that you borrow a large sum but the loan duration is usually two to six years. How does the financing department figure out the monthly payment at a 2.9% interest for a $32,000 car? Given the interest they choose it to be the constant payment such that the present value of my car payments at a 2.9% rate is $32,000 16
69 MONTHLY PAYMENTS REQUIRED ON PER $1000 OF LOAN (FOR SEVERAL INTEREST RATES AND LOAN DURATIONS) Interest rate -> Years 20% 10% 5% 2% 1%
70 EXAMPLES FROM THIS TABLE If you borrow $1000 and promise to pay it back monthly over 5 years at 5% interest you will owe $18.87 per month. If you borrow $1000 and promise to pay it back monthly over 10 years at 20% interest you will owe $19.33 per month. 18
71 FUTURE VALUE Future value: the interest-adjusted value of past payments. That is if I put $Y in the bank today and take it out n years from now I get $Y (1 + r) n dollars when I take it out 19
72 RISK AND REWARD Risk: the possibility that the investor will not get those anticipated payoffs Default Risk: the risk to the investor that the borrower will not pay Market Risk: the risk that the market value of an asset will change in an unanticipated manner Reward Risk Premium the reward investors receive for taking greater risk 20
73 THE YIELD CURVE Yield Curve: the relationship between reward and the time until the reward is received US Treasury Yield Curve (January 2005) 21
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