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We develop an efficiency measurement framework for systems composed of two subsystems arranged in series that simultaneously computes the efficiency of the aggregate system and each subsystem. Our approach expands the technology sets of each subsystem by allowing each to acquire resources from the other in exchange for delivery of the appropriate(More)
The literature on quasi-convexity contains several conjugacy relations (usually denoted by *) for quasi-convex functions [3, 6, 7, 10, 11]. ~ Unfortunately, none of the proposed conjugates are symmetric. In this paper, we define a symmetric conjugacy relation for quasi-convex function, along the lines of [2], and derive necessary and sufficient conditions(More)
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