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This paper examines the incentives for firms to share information vertically in a two-level supply chain in which there are an upstream firm (a manufacturer) and many downstream firms (retailers). The retailers are engaged in a Cournot competition and are endowed with some private information. Vertical information sharing has two effects: "direct effect" due to the changes in strategy by the parties involved in sharing the information and "indirect effect" (or "leakage effect") due to the changes in strategy by other competing firms (who may infer the information from the actions of the informed parties). Both changes would affect the profitability of the firms. We show that the leakage effect discourages the retailers from sharing their demand information with the manufacturer while encouraging them to share their cost information. On the other hand, the direct effect always discourages the retailers from sharing their information. When voluntary information sharing is not possible, we identify conditions under which information can be traded and show how price should be determined to facilitate such information exchange. We also examine the impact of vertical information sharing on the total supply chain profits and social benefits.

We consider information sharing in a decentralized supply chain where one manufacturer supplies to multiple retailers competing in price. Each retailer has some private information about the uncertain demand function which he may choose to disclose to the manufacturer. The manufacturer then sets a wholesale price based on the information received. The information exchange is said to be confidential if the manufacturer keeps the received information to herself, or nonconfidential if she discloses the information to some or all other retailers. Without confidentiality, information sharing is not possible because it benefits the manufacturer but hurts the retailers. With confidentiality, all parties have incentive to engage in information sharing if retail competition is intense. Under confidentiality, the retailers infer the shared information from the wholesale price and this gives rise to a signaling effect that makes the manufacturer's demand more price elastic, resulting in a lower equilibrium wholesale price and a higher supply chain profit. When all retailers share their information confidentially, they will truthfully report the information and the supply chain profit will achieve its maximum in equilibrium.information sharing, confidentiality, signaling, supply chain coordination, truth telling

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We present a model of market competition in which customer preferences are over not only price and quality but also delivery speed. This allows a study of market demand and firms' decisions on price, quality, technology and responsiveness in a competitive environment. When demand arises, a customer chooses the firm that maximizes its expected utility of price, quality and response time. The demand function for each firm is derived by analyzing a queueing system with competing servers. We then study price competition among firms with differentiated processing rates. In the equilibrium, the firm with a higher processing rate always enjoys a price premium, and, further, enjoys a larger market share when its opponent also has adequate processing rate to serve all the customers alone.two-server queues, time-sensitive customers, pricing, delivery-time competition, Nash equilibrium