1 Department of Management, Jan Evangelista Purkyne University, Ústí nad Labem, Czech Republic. Electronic address: slavik@ieep.cz.
2 Center for Philanthropy Studies, University of Basel, Switzerland; Department of Management, University of Economics in Prague, Czech Republic. Electronic address: oto.potluka@unibas.ch.
3 Department of Geography, Jan Evangelista Purkyne University, Ústí nad Labem, Czech Republic. Electronic address: kristyna.rybova@ujep.cz.