摘要：Attempts can be found in the DEA literature to identify returns to scale at efficient
interior points of the production possibility set on the basis of returns to scale at points of the
corresponding reference sets. However, an opposite approach is put forward in this paper,
advocating that returns-to-scale properties of efficient reference units should be found by
identifying first returns to scale of an efficient interior unit that is a radial projection to the
frontier of an inefficient unit. Returns-to-scale properties of both the corresponding reference
units and units supporting the face in question can then be established.
关键词：Returns to scale, DEA, Interior points, Vertices
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