Combinatorial auctions are used to allocate many items to different bidders with varying values. Multi-unit auctions, a basic form of these auctions, aim to maximize social welfare by assigning identical items to bidders based on their valuations. The researchers focused on creating mechanisms that encourage bidders to truthfully report their valuations, leading to fairer outcomes. Their findings show that by designing incentive-compatible mechanisms, it is possible to ensure that bidders are motivated to be honest about their preferences, ultimately improving the efficiency of the auction process.