Roeger's method (Roeger, 1995), which analyses the relationship between primal and dual productivity measures, can also be used to directly estimate from readily available data the static welfare loss due to a suboptimal allocation of the factors of production.

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Economics Letters
Erasmus School of Economics

van Dijk, M.A, & van Bergeijk, P.A.G. (1997). Resource Misallocation and Mark-ups: An Alternative Estimation Technique for Harberger Triangles. Economics Letters, 54, 165–167. doi:10.1016/S0165-1765(97)00021-9