The increase of competitiveness between suppliers and the possibility to make downward bids to improve their commercial offer compared to the others, guarantees the achievement of the best purchase price.
competitiveness between your suppliers:
you will receive the best offers in real time.
the auction is previously arranged: length of time, downwards, re-openings…
eventually, five minutes before the deadline, suppliers can present a last bit without seeing the offers of the other players
the first part of the auction provides offers from different companies