the Institute of Agricultural and Food Economics – National Research Institute, Department of Finance and Risk Management; ul. Świętokrzyska 20, 00-002 Warsaw, Poland
the Institute of Agricultural and Food Economics – National Research Institute, Department of Finance and Risk Management; ul. Świętokrzyska 20, 00-002 Warsaw, Poland
the Institute of Agricultural and Food Economics – National Research Institute, Department of Finance and Risk Management; ul. Świętokrzyska 20, 00-002 Warsaw, Poland