How can we improve the performance of supply chain contracts? An experimental study

► We propose five approaches to improve order quantity decisions in supply chain contracts. ► We show the coordinating form of revenue sharing contracts designed for a risk-averse retailer. ► We show coordinating forms of supply chain contracts when free items offered by the supplier. ► We examine the effectiveness of each proposed approach through laboratory experiments. ► Offering free items and providing collective feedback can improve the performance of contracts.