We examine how policies for the ownership and control of consumer-generated data affect market outcomes in the online advertising industry. When advertisers have strong property rights over data regarding consumers' active purchase interests, competition between ad exchanges leads to too little...

I propose a framework in which asymmetric multi-product retailers compete for one-stop shoppers who have biased beliefs about their future purchase probabilities (and so make unplanned purchases). One firm carries a full portfolio of products while the other carries an incomplete but endogenous...