This study investigates the measurement of the efficiency of product markets by means of Data Envelopment Analysis (DEA). To demonstrate how comparing average efficiencies derived by DEA across markets may lead to conclusions driven mainly by the effects of sample size when the samples differ...

This study introduces the concept of product performance from the perspective of customers. Product performance is measured as a ratio of outputs that customers obtain from a product relative to inputs that customers have to spend for purchasing and using the product. The output side is modelled...