The article discusses different auction pricing rules and their impact on bidder behavior and auction efficiency. The researchers found that a clock auction with lowest-accepted bid pricing can lead to bid shading by provisional winners, causing inefficiency. In contrast, an auction with highest-rejected bid pricing is simpler, more efficient, and can generate higher revenues. The fear of losing at profitable prices can drive bidders to bid more aggressively in the lowest-accepted bid auction, potentially resulting in higher revenue in certain scenarios. This sheds light on why India chose the lowest-accepted bid auction for its 3G spectrum auction, despite the potential advantages of the highest-rejected bid auction.