Retracted article: Gumarova F.Z. Investitsionnaya politika regiona kak instrument povysheniya konkurentosposobnosti APK Respubliki Marii El [Investment policy of the region as a tool for improving competitiveness of agrarian and industrial complex of the Republic of Mari El]. Vestnik of the Mari State University. Chapter “Agriculture. Economics”. 2015, no. 3, pp. 5359 (In Russ). This article by Faina Z. Gumarova (E-mail: gumarovaf@mail.ru) has been retracted (i. e. withdrawn from the press) by the editor with permission of the author and publisher. The reason for the article retraction is duplicate publication: the author has published the same article under the title “Investment policy of the region as a tool for improving competitiveness of agrarian and industrial complex of the Republic of Mari El” in the journal “Fundamental'nye issledovaniya” [“Fundamental research”] (2014, no. 11–12, pp. 2677–2680). The Editorial Board apologizes for any inconvenience this retraction may have caused.