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project buyer auction supplier relationship marketplace exchange service effect vendor study market research contract transaction negotiation evaluation number information management evaluation costs performance portfolio result cluster exchange relationships price mechanism chapter allocation analysis value model tactic level journal experience bidding table literature buyer-supplier relationships choice business development outcome quality process construction procurement system boundary buyer-supplier promotor context design project managers allocation mechanism choice behaviour boundary spanners manager theory difference competence exchange competences bid evaluation interaction approach increase characteristic party budget project value bidder spanner stage industry trust impact complexity execution
