where bij is the share of stand type j
Pwithin a forest landscape i with a property 4
jD1 bijD10 for each i. Accordingly, at the
‘initial’ state, bijD025 (while a modification
of the composition can be expected to increase
the overall recreation value). The total recreation
values vi for iD.A/, (B), (C), (D) are
already known (Mattsson and Li, 1994a), and
we calculate the interaction effect ai as the
difference between vi and Qvi, i.e. aiDvi