Calculate it here!
where: a = Periodic Payment amount t = Interval in years between payments (like the interval between timber harvests) i = compound interest rate V_{0} = Value at year 0 

The famous, often
used,
wonderful...
Soil Expectation Value
(also known as the
Present
Value of a Perpetual Periodic Series)
This one is very useful formulae because as we will see, it helps us define the value of bare land used for forestry; the Soil Expectation Value. You see, many forest properties yield income periodically at the end of a cutting cycle or at the end of a rotation, rather than annually (like agricultural land). It is often desirable to find the present value of a perpetual periodic series to determine the potential value of this land for forestry use. In fact, this formulae will help you to determine the value of bare land with no trees on it. It tells us the value of bare land with no higher and better use than to grow trees.
The present value of this series can be found by first assuming the following:
a = amount of periodic payment
t = interval between periodic payments
Then, the year "t" payment value in year 0 =Now we can summarize these payments by adding them together
The year 2t payment value in year 0 =
The year 3t payment value in year 0 =
The year infinity payment value in year 0 =
V_{0} = + + + …In this case we can see that each of the expressions in the series possess (1 + i)^{t} in the denominator. This is a geometric series, like many we have seen before. Remember that the general formulae for a geometric series is: So if we substitute
S = V_{0}Then the following will be true
b = a / (1+i)^{t}
r = 1 / (1+i)^{t}
Think about the substitution for (1r)^{m}
and how that portion of the equation will react as m approaches
infinity.
So if we multiply the numerator and denominator by (1 + i)^{t}. we obtain a modified calculation.
Present Value of a Perpetual Periodic Series
At 9% interest, what is the
present value
of bare land for growing successive crops of Hybrid Poplar from a tract
that yields $30,000 of net revenue every 10 years?

How would the result in ( a ) have been different if the stand was mature and ready for its first harvest tomorrow? Keep the solution we calculated
above and
add in the current harvest value of $30,000 for a total asset value of
$51,940.

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