In this paper we show that in order to aggregate individual efficiency scores into a group (e.g.,
industry) efficiency score, in such a way that the multiplicative structure of further
decompositions is preserved with equal weights across components, the weighted geometric
mean is required. We also show how the weights can be chosen using a variation of a theorem
by Koopmans (1957). In the end, our paper provides a mathematically consistent and
economic-theory justified way of aggregation of Farrell-type efficiency scores
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