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Interest Rates Chapter

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**Outline Interest Rate Quotes and Adjustments**

The Effective Annual Rate (EAR) and the Annual Percentage Rate (APR) The determinants of Interest Rates Real versus Nominal Interest Rates The Yield Curve Further questions

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**Interest Rates Quotes and Adjustments**

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**The Effective Annual Rate (EAR)**

The effective annual rate reflects the dollar interest received from investing $1 for 1 year. This is the rate we have been considering up till now. This EAR is often quoted as “Annual Percentage Rate” or “APR” when payments are made throughout the year such as mortgages, car loans and other investments

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Effective Annual Rate Interest rates for periods smaller than one year: Given a certain EAR we can calculate the interest accumulated for a shorter period than one year. Example: Receiving 5% for one year is equivalent to receiving 2.47% every six months At the end of the first six months we have $ If this amount is reinvested for the rest of the year, then $1.05 is accumulated in total

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Effective Annual Rate

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**Annual Percentage Rate (APR)**

The annual percentage rate (APR) indicates the amount of simple interest earned in one year, that is the amount without the effect of compounding – it does not fully take into account the time value of money The APR is quoted for a given number of compounding periods The compounding period can be “annual”, “semiannual”, “quarterly”, “monthly”, or even “daily”

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Converting APR to EAR The interest received per compounding period for an APR with k compounding periods is: Converting APR to EAR

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Converting APR to EAR

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**Annual Percentage Rate (APR)**

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**Annual Percentage Rate (APR)**

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**Application: Amortizing Loans**

In amortizing loans each periodic payment is the same which means that each period you pay interest on the loan and some part of the loan balance.

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**Application: Amortizing Loans**

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**The Determinants of Interest Rates**

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**Nominal and Real Interest Rates**

Nominal interest rate: is the rate we have been using till now for discounting future cash flows and it indicates the rate at which your money will grow if invested for a certain period Real interest rate: is the rate of growth of your purchasing power, after adjusting for inflation. rR is the real interest rate i is the rate of inflation

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**Interest Rates and Inflation**

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**The Yield Curve of Interest Rates**

Interest rates change depending on the horizon of the investment: Banks often offer different rates on loans depending on their term The Yield Curve: depicts the Term Structure of interest rates or the relation between the investment term and the interest rate

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**The Term Structure of Risk-Free U.S. Interest Rates**

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**Present Value Calculation**

We can calculate the present value of a stream of cash flows using the term structure of interest rates

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**Present Value Calculation**

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Further questions

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College Question 10 (2nd Edition): Your son has been accepted into college. This college guarantees that your son’s tuition will not increase for the four years he attends college. The first $10,000 tuition payment is due in six months. After that, the same payment is due every six months until you have made a total of eight payments. The college offers a bank account that allows you to withdraw money every six months and has a fixed APR of 4% (semiannual) guaranteed to remain the same over the next four years. How much money must you deposit today if you intend to make no further deposits and would like to make all the tuition payments from this account, leaving the account empty when the last payment is made?

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**College The required deposit to cover all future tuition expenses**

Eight payments of $10,000 due semiannually and starting six months from now. The six month interest rate is The required deposit to cover all future tuition expenses

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Car Dealer Loan Question 22 (2nd Edition): You need a new car and the dealer has offered you a price of $20,000, with the following payment options: (a) pay cash and receive a $2000 rebate, of (b) pay a $5000 down payment and finance the rest with a 0% APR loan over 30 months. But having just quit your job and started an MBA program, you are in debt and you expect to be in debt for at least the next 2.5 years. You plan to use credit cards to pay your expenses; luckily you have one with a low (fixed) rate of 15% APR (monthly). Which payment option is best for you?

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**Car Dealer Loan The car dealer is offering tow alternatives:**

A loan at 0% APR compounded monthly – or in other words: an initial payment of $5,000 and 30 monthly payments of $500 thereafter. $2,000 rebate. The cost of the car under dealer financing is:

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