Prawo Zamówień Publicznych no. 1/2014 CREDIBILITY OF THE PRICED BILL OF QUANTITIES Andrzej Borowicz Checking economic credibility of a public procurement bidder Mariusz Andrzejewski, Tomasz Maślanka, Jakub Bator, Bartosz Gołębiowski Bid riggings in public procurement Ryszard Szostak Fulfilment of conditions for participation in the proceedings by syndicated bidders Krzysztof Horubski, Tadeusz Kocowski Sufficient expertise and experience as a condition for public procurement bidding Magdalena Grabarczyk The problem of an abnormally low price in public procurement Małgorzata Moras Permissible correction of errors in tenders Aldona Kowalczyk Sub-Contracting in Public Contracts Włodzimierz Dzierżanowski Contractual penalties in the current practice of public procurement Zdzisław Gordon Statutory warranty for defects of the object of a public procurement contract vs. quality assurance Jolanta Loranc-Borkowska Non-price bid evaluation criteria in current practice Izabela Rzepkowska