SOLUTION METHODS FOR NONCONVEX FREE DISPOSAL HULL MODELS: A REVIEW AND SOME CRITICAL COMMENTS

This note first succinctly summarizes the currently available methods to solve the various nonconvex free disposal hull (FDH) models for technical efficiency as well as for minimum costs. It also offers some empirical illustration as to their computational efficiency. Second, this note briefly points out that the recent article by (26) and its correction by (4) proposing an extended enumeration method to solve for technical efficiency evaluated relative to this family of FDH models contain no original results.