Fig. 9
From: Which type of forest management provides most ecosystem services?
Carbon balance and removal of CCF (large black dot) and RFM (white open circle) in unconstrained optimization and in the case where the removal is constrained to be the same in both management systems (circles filled with grey). The solid line is the trade-off curve assumed in DEA when only the unconstrained solutions are available. The additional constrained solutions reveal that the trade-off line is further from origin for CCF than RFM. As a result, a non-zero slack is obtained for RFM leading to the conclusion that RFM is weakly efficient