This paper provides a theoretical framework which integrate the conventional methodology for measuring the productive e¢ ciency and the monetary assessment of social welfare changes associated with public sector performance. Two equivalent measures of social welfare changes generated by an improvement (or worsening) in productive e¢ ciency are deduced using duality theory. The .rst one is obtained from the cost function, while the second one arises directly from the production function. Moreover, the paper induces the application of the theoretical framework proposed to empirical analysis.
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