Kosiorowski, D., Mielczarek, D. and Rydlewski, J.P. 2020. A Critical Study of Usefulness of Selected Functional Classifiers in Economics. Acta Universitatis Lodziensis. Folia Oeconomica. 2, 347 (Apr. 2020), 71–90. DOI:https://doi.org/10.18778/0208-6018.347.05.