Fighting Collusion In Auctions Case Study

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1. Research Aims
Collusion in auctions is a non-competitive agreement between bidders to collaborate and maximise their total profit by reducing or eliminating competition. It is a primary concern for auctioneers as people who form cartels can significantly harm the seller’s revenue. The aim of the paper “Fighting collusion in auctions: An experimental investigation” is to compare collusive properties of three types of auctions and how effective they are in deterring collusion which are:
• English auction (EN) – where bidders outbid each other until no-one else is willing to bid against the current bid. The participant who placed the current bid wins the auctions and pays the bid amount.
• First-price sealed-bid auction (FP) – Where bidders simultaneously place bids without the knowledge of each other’s bids. The highest bidder wins the auction and pays the bid amount.
• Amsterdam auction (AMSA) – Where bidders bid in two phases. In phase 1, the auctioneer raises the price until only 2 bidders remain. In phase 2, the remaining bidders submit sealed bids and the highest bid pays the price equal to the second highest bid. Both bidders also receive a premium which is a fraction of the difference between the second highest bid and bottom price (Hu, Offerman & Onderstal, 2009).

2. Model
To test these models in collusion, bidders interact in a three-stage game and can be of type risk neutral, strong or weak. In the first stage, the strong bidders vote for or against forming a cartel and a cartel is only formed if they all agree. When they form a cartel they incur a cost. In the second stage, if a cartel is formed the strong bidders interact in a pre-auction knock-out mechanism where all bidders submit a sealed bid and the highest bidd...

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..., 2013). As these contractors are risk-averse, they will drop out in the first phase leaving only the most efficient contractors to compete against each other. Furthermore the inclusion of a premium, offers less incentive for collusion as contractors are more inclined to deviate from a cartel to receive a higher payoff. Although theoretically feasible in a controlled environment, in real life there are laws and regulations that protect firms against collusive practices. In the case where the client may suspect collusion is a real possibility, AMSA offers the most effective collusion deterrence. However administratively it may be difficult to implement phase 1, where the price sequentially drops as the tender process takes several months with contractors rarely interacting with each other compared to an auction where the bidders are together and bid in one sitting.

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