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Copyright of Zeszyty Naukowe SGGW: Ekonomika i Organizacja Logistyki is the property of Warsaw University of Life Sciences (SGGW), Faculty of Economic Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)