This study provides new identification and estimation results for ascending (traditional English or online) auctions with unobserved auction‐level heterogeneity and an unknown number of bidders. When the seller's reserve price and two order statistics of bids are observed, we derive conditions...

Despite global economic downturn, online trade, in particular the sale of counterfeitgoods via the Internet, continues to soar. An important player in this game is theonline auction provider. Though it is not the direct infringer, trademark owners see itas the logical legal defendant. Due to the...