FNCE10002 Lecture Notes - Lecture 2: Cash Flow, Market Price, Investment
Principles of Finance
Lecture 2: Introduction to Financial Mathematics and Debt
Valuing Perpetuities and Annuities
A perpetuity is an equal, periodic cash flow that goes on forever. Cash flows occur at the end of each
period. The present value of a perpetuity is:
Where C = cash flow and r= rate
A deferred perpetuity is an equal periodic cash flow that starts at some future date and then goes on
forever. The present value of the perpetuity is deferred to the end of time period n+1 is:
Where n= number of periods.
A growth perpetuity is a perpetuity of C dollars today growing at a constant rate of g percent per
period and has the cash flow stream C(1 + g), C(1 + g)2, ... C(1 + g)n, and so on. Note that the first cash
flow is C(1 + g) not C. The present value of a growth perpetuity is:
Where g = growth rate.
Note this C(1+g) is for when t=1, so if given t=0, t=1 must be found first.
Valuing Ordinary Annuities
An ordinary annuity is a series of equal, periodic cash flows occurring at the end of each period and lasting
for n periods with n cash flows. That is the first cash flow is at the end of period 1 and the last cash flow is
at the end of period n. Ordinary annuities can be valued as the difference between two perpetuities:
The present value of an ordinary annuity over n time periods can be obtained as the difference between an
ordinary perpetuity (starting at the end of period 1) and a deferred perpetuity (starting at the end of
period n+1). Given in the equation:
The future value of an ordinary annuity is found by computing the future value of the above present value
at time period n:
Valuing Deferred Ordinary Annuities
A deferred ordinary annuity is a series of equal, periodic cash flows occurring at the end of each
period where the first cash flow occurs at a future date.
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Document Summary
Lecture 2: introduction to financial mathematics and debt. A perpetuity is an equal, periodic cash flow that goes on forever. Cash flows occur at the end of each period. Where c = cash flow and r= rate. A deferred perpetuity is an equal periodic cash flow that starts at some future date and then goes on forever. The present value of the perpetuity is deferred to the end of time period n+1 is: A growth perpetuity is a perpetuity of c dollars today growing at a constant rate of g percent per period and has the cash flow stream c(1 + g), c(1 + g)2, c(1 + g)n, and so on. Note that the first cash flow is c(1 + g) not c. the present value of a growth perpetuity is: Note this c(1+g) is for when t=1, so if given t=0, t=1 must be found first.