The impact of timing on bidding behavior in procurement auctions of contracts with private costs

We provide a comparison of bidding behavior between multi-round and single-round auctions considering bid lettings for asphalt construction contracts. Using a reduced-form difference-in-difference approach as well as the nonparametric estimation technique proposed by Racine and Li (2004) we find that, bidding is more aggressive in a sequential multi-round setting than in a simultaneous single-round format. We explore potential causes for the bidding difference across formats related to synergies and level of bidder participation.