The Normal Forest and Maximum Sustainable Yield
Suppose that a normal forest is A hectares in extent, and consists of tr stands of timber, each
of area A/tr hectares, where tr is the rotation age, and that it contains one stand of timber
corresponding to each age class from 1 to tr. Assuming that the forest area is uniform in terms
of its productivity, the volume of timber per hectare on a stand in any year is given by x(t),
where x(t) is the biological production function. The volume of timber cut each year is given
by: