Row 1 The investment in the first row provides a perpetual stream of $1 starting at the end
of the first year. We have already seen that this perpetuity has a present value of 1/ r.
Row 2 Now look at the investment shown in the second row of Figure 2.7 . It also provides
a perpetual stream of $1 payments, but these payments don’t start until year 4. This stream of
payments is identical to the payments in row 1, except that they are delayed for an additional
three years. In year 3, the investment will be an ordinary perpetuity with payments starting in
one year and will therefore be worth 1/ r in year 3. To find the value today, we simply multiply
this figure by the three-year discount factor. Thus