Electronic reverse auctions (ERAs) are a controversial sourcing tool. While they are said to have many advantages to buyers, and even some to suppliers, ERAs are also heavily criticised for damaging cooperative buyer-supplier relationships. It is often suggested that suppliers experience more disadvantages than advantages from the use of this tool and therefore many, if not all suppliers dislike ERAs. In this paper, Erik van Raaij and colleagues investigate whether all suppliers indeed dislike ERAs and the relationships between supplier characteristics and supplier opinions of ERAs.