In summary, for a stand of trees which has no alternative use other than the production of
timber from a single rotation, the rule for economic efficiency is to cut the trees when the rate
of growth of value of timber has fallen to equal the rate of interest. The application of this
rule, which was developed by Irving Fisher and is sometimes called `Fisher´s Rule`, is
illustrated in Figure 4 which shows three paths to riches: (1) cut the timber now and put the
money in the bank; (2) keep the stand of timber no matter what; or (3) maintain the stand of
trees as long as the stumpage value is growing faster than the rate of interest, and then shift
your assets to the bank. The latter strategy is shown to be the best of the three