digital demand for cameras on ebay christopher p adams ftc william vogt carnegie mellon and nber email cadams gov or wilibear andrew cmu edu march 29 2004 abstract the paper estimates new sold in auctions data seems to offer significant advantages over traditional transactions estimating differentiated products how ever there are a number of concerns including censoring bias terpretation bidding behavior this presents results from three different methods suggest that is highly elastic isn t lot substitution particularly across brands thanks laura bivins george deltas mike sandfort unjy song steve tenn otherftccolleaguesforhelpfuldiscussions thanksalsotohaoxuforprovidingthedata finally peter newberry jorge roberts jeanne schoenfelder excellent research assistance note does not necessarily represent views commission any individual commissioners all remaining errors our own 1 introduction other auction sites have potential pro vide important information consumer
