ESC IRRU  A Euro p e a n Re se a rc h Pro je c t Fund e d b y the 6th Fra me wo rk Pro g ra mme a nd Ma na g e d b y DIW Be rlin ESC IRRU Wo rking Pa p e r No . 15 Standard and Non- standard Employment in Russia: How large is the wage gap? Ta tia na Ka ra b c huk Ce ntre fo r La b o ur Ma rke t Stud ie s, Hig he r Sc ho o l o f Ec o no mic s, Mo sc o w Be rlin, Ja nua ry 2010