The relevance of DEA benchmarking information and the Least-Distance Measure: Comment

Recently, in a Data Envelopment Analysis (DEA) framework, Baek and Lee (2009) [1]introduced a weighted Least-Distance Efficiency Measure to obtain the “shortest” projection from a considered unit to the strongly efficient production frontier. The mentioned authors tried to show that the proposed measure is well defined. Unfortunately, they did not succeed, because it lacks monotonicity, as we will show in what follows.