When a range of permitted activities is specified in general endbling laws,local managers' decisions are already constrained to some extent.significantproblems can still exist,however,in terms of whether the activities that are permitted should be pursued together throughout an area or whether manger should identify separate nonintersecting portion of the land for thr pursuit of each activities by itself. Suppose two activities might be pursued on a given land area. Should both be allowed over the whole area,or should it be divided,with one activity allowed on one part and the other on the other part? The relevant comparison would seem to be straightforward : the sum of the net benefits of the separate areas compared to the net benefits of the two activities when they are pursued together over the larger area