E¢ ciency and ownership structure - the case of Poland Preliminary version! Karl-Markus ModØn 1 Pehr-Johan Norbck 2 Lars Persson 3 May 3, 2004 1 Karlstad University. E-mail: karl-markus.moden@sh.se 2 The Research Institute of Industrial Economics. Email: pjn@iui.se. 3 Research Institute of Industrial Economics. Email: larsp@iui.se.