Generic drugs play an important role in disciplining drug prices and controlling rising drug costs. However, the effect that an additional generic drug competitor has on drug prices is difficult to measure because the number of firms competing in a market is endogenously determined. We identify...

We investigate the effect of competition on price dispersion in the airline industry. Using panel data from 1993 to 2008, we find a non-monotonic effect of competition on price dispersion. An increase in competition is associated with greater price dispersion in concentrated markets but is...

Does the internet increase competition? To address this question, I exploit two institutional details unique to Germany: (1) Some municipalities received glass fibre cables that cannot be upgraded to DSL; I use these municipalities as a treatment group with reduced online competition. (2) German...

This paper analyzes the effects of market structure on price dispersion in the airline industry, using panel data from 1993 through 2006. The results found in this paper contrast with those of Borenstein and Rose (1994), who found that price dispersion increases with competition. We find that...

Interstate highway openings were permanent, anticipated demand shocks that increased gasoline demand and sometimes shifted it spatially. We investigate supply responses to these demand shocks, using county-level observations of service station counts and employment and data on highway...

This paper explores entry and exit at a price comparison site (PCS) where the sunk costs of participation are effectively zero. We first use a panel of 295 products on NexTag.com to estimate an error correction model of net entry. While the results support our characterization of the PCS as a...

This paper studies asymmetric price responses of individual firms, via daily retail prices of almost all gasoline stations in the Netherlands and suggested prices of the five largest oil companies over more than two years. I find that 38% of the stations respond asymmetrically to changes in the...

We study price dynamics for computer components sold on a price-comparison website. Our fine-grained data — a year of hourly price data for scores of rival retailers — allow us to estimate a dynamic model of competition, backing out structural estimates of managerial frictions. The estimated...

We study price dynamics for computer components sold on a price-comparison website. Our fine-grained data - a year of hourly price data for scores of rival retailers - allow us to estimate a dynamic model of competition, backing out structural estimates of managerial frictions. The estimated...

We study price dynamics for computer components sold on a price-comparison website. Our fine-grained data -- a year of hourly price data for scores of rival retailers -- allow us to estimate a dynamic model of competition, backing out structural estimates of managerial frictions. The estimated...