A DMU is said to operate at increasing returns to scale (IRS) if a proportionate increase in all of its inputs results in a greater than proportionate increase in its outputs. If for a given unit the sum of its dual weights in the dual model turns out to be less than 1, then that unit can be said to operate at IRS, assuming it is technically efficient.
Increasing returns to scale
by Ali Emrouznejad & Rajiv Banker
William W Cooper
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