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This study modifies the Russell graph measure of efficiency to find theclosest target from the assessed decision-making unit to the efficient frontierof an empirical production possibility set using an extended facet approach.The closest target requires a single improvement in either an output term or aninput term, and needs some positive levels of all inputs to achieve the outputtarget. The practical advantage of the proposed efficiency measure isdemonstrated numerically in comparison to other existing non-radial efficiencymeasures.

Closest targets in Russell graph measure of strongly monotonic efficiency for an extended facet production possibility set