FIN111 Lecture 6: fin111 lecture w6

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Week 6
Fin111 Lecture Notes
Discounted Cash Flows And Valuation!
Valuing Level Cash Flows - Annuities & Perpetuities!
-Annuity - finite series of equal payments that occur at regular intervals!
If the first payment occurs at the end of the period it is called an ordinary
annuity!
If the first payment occurs at the beginning of the period it is called an annuity
due!
-Perpetuity - infinite series of equal payments (cash flows continue forever)!
-Growing perpetuities - in addition to constant cash flow streams one may have to
deal with cash flows that grow at constant rate over time!
Effective Annual Rate (EAR)!
-This is the actual rate paid (or received) after accounting for compounding that
occurs during the year!
-If you want to compare two alternative investments with dierent compounding
periods you need to compute the EAR and use that for comparison!
Annual Percentage Rate (APR)!
-This is the annual rate that is quoted by law!
-By definition APR = period rate times the number of periods per year / quoted
interest rate!
-So to get the period rate we rearrange the APR equation to… period rate = APR
over number of periods per year!
-You should never divide the eective rate by the number of periods per year as it
will not give you the period rate!
Things To Remember!
-You always need to make sure that the interest rate and time period match!
If you are looking at annual periods you need an annual rate!
If you are looking at monthly periods you need a monthly rate!
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Document Summary

Valuing level cash flows - annuities & perpetuities. Perpetuity - in nite series of equal payments (cash ows continue forever) Growing perpetuities - in addition to constant cash ow streams one may have to deal with cash ows that grow at constant rate over time. This is the actual rate paid (or received) after accounting for compounding that occurs during the year. If you want to compare two alternative investments with di erent compounding periods you need to compute the ear and use that for comparison. This is the annual rate that is quoted by law. By de nition apr = period rate times the number of periods per year / quoted interest rate. So to get the period rate we rearrange the apr equation to period rate = apr over number of periods per year. You should never divide the e ective rate by the number of periods per year as it will not give you the period rate.

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