We test whether short-sellers in U.S. stocks are able to predict future returns based on new SEC-mandated data for 2005. There is a tremendous amount of short-selling activity during the sample: Short-sales represent 24 percent of NYSE and 32 percent of Nasdaq share volume. Our analysis shows that short-sellers primarily target short-term overreaction in stock prices, but they are also able to ...

Hybrid marketplaces, such as Amazon's and Zalando's stores or Apple's Google's app stores, which distribute their own products services in competition with those of third-party sellers, play a significant growing role the Internet economy. This paper shows that, other things equal, platforms would maximize profits if they lowered fees charged to sellers prices consumers response cooperation agr...

The Internet commerce technologies have significantly reduced sellers’ costs of collecting buyer preference information and managing multiple prices, enabling cost efficient custom product design and differentiated pricing. Advanced manufacturing technologies have also improved sellers’ manufacturing flexibility. We show that an early adopter of customization has a firstmover advantage, support...

In the context of electronic commerce, the problem of unfair ratings arises when modeling the trustworthiness of a selling agent relies (partially) on propagation of ratings provided by buying agents that have personal experience with the seller. Extreme diversity of open and dynamic electronic marketplaces causes difficulties in handling unfair ratings in trust management systems. To ease this...

In electronic marketplaces, reputation systems and incentive mechanisms are prevalently employed to promote the honesty of sellers and buyers. In this article, we focus on the scenario in which the inventory is in short supply, i.e. an e-marketplace with limited inventory (EMLI). The challenges are in two-fold: (a) for sellers who aim to maximize their profit, they may intentionally conduct dis...

In current markets of perishable goods such as fish and vegetables, sellers are typically in a weak bargaining position, since perishable products cannot be stored for long without losing their value. To avoid the risk of spoiling products, sellers have few alternatives other than selling their goods at the prices offered by buyers in the markets. The market mechanism needs to be reformed in or...

In the context of electronic commerce, when modeling the trustworthiness of selling agent relies (in part) on propagating ratings provided by buying agents that have personal experience with the seller, the problem of unfair ratings arises. Extreme diversity of open and dynamic electronic marketplaces causes difficulties in handling unfair ratings in trust management systems. To ease this probl...

The two leading online consumer-to-consumer platforms use very different revenue models: eBay.com in the United States uses a brokerage model in which sellers pay eBay on a transaction basis, whereas Taobao.com in China uses an advertising model in which sellers can use the basic platform service for free and pay Taobao for advertising services to increase their exposure. This paper studies how...

To explain, in multi-agent based e-marketplaces, self-interested selling agents may act maliciously by not delivering products with the same quality as promised. It is thus important for buying agents to analyze their quality and determine which sellers to do business with, based on their previous experience with the sellers. However, realistically, in most e-marketplaces, buyers often encounte...