Third-party sellers in online marketplaces provide wide product/service variety and are highly heterogeneous in the capability of delivering value to buyers. Seller variety and value heterogeneity shape seller competition, which then affects the marketplace owner’s profit. This paper presents...

Proprietary retailer-sponsored web panels are growing in popularity. We examine specific ways in which retailers may benefit from the creation of web panels and participation of customers in them. A quasi-experiment conducted in the field with a large online retailer using eighteen months of...