The aim of the paper has been to determine the reasons for technological in effectiveness of the economies of Polish regions (i.e. voivodeships). In order to do so, we have used the modified method of non-radial Data Envelopment Analysis, which allowed us to determine partial indexes of technological effectiveness separately for the labour factor and the material capital factor. As a result, we have been able to state that the main source of tech nological ineffectiveness of technologies used in regional economies lies in relatively lower and spatially differentiated technological effectiveness compared to the technological effectiveness of the material capital factor. In view of the results, we have extended the study over three sectors of the economy and considered the substitution processes occurring between them. Adapting such a research objective has made it possible to identify the reasons of the ineffectiveness of the analyzed economies and of those characterized by a relatively low technological effectiveness. A technology has been proposed which will help to overcome the technological inadequacies in the most effective way.