We consider the price and welfare effects of competition in targeted product design, in the context of the Salop circle model. Changes in product design lead to demand rotations that set the stage for our analysis. With an exogenous number of firms, we show that the degree of targeted product...

Digital advertising markets are growing and attracting increased scrutiny. This paper explores four market inefficiencies that remain poorly understood: ad effect measurement, frictions between and within advertising channel members, ad blocking and ad fraud. These topics are not unique to...

Retailers act as intermediaries between manufacturers and consumers. When retailers sell their own products alongside those of manufacturers, what is the effect on competition? Further, how does this effect hinge on market power? In this paper, I theoretically and empirically study the effect of...