affected the incidence of HIV. Using a natural experiment setup, we identify the effects of Craigslist's entry on HIV trends by …'s entry leads to a 19.8 percent increase in HIV cases, which maps out to an average of 158.7 cases for a state in a year. The …. The increases in HIV cases as a result of Craigslist entry are estimated to impose treatment costs of over $118 million …

We estimate a dynamic oligopoly entry game in the early U.S. local telephone market. We observe the identities of … potential entrants into local markets and therefore the waiting time of each potential entrant before it commits actual entry …. We find that firm-level heterogeneity in entry costs plays a significant role in determining a firm's entry behavior into …

We test the effect of entry on the tariff choices of incumbent cellular firms. We relate the change in the breadth of … from personal communications services (PCS) firms. Entry by PCS competitors differed across geographic markets due to the … upgrade their technology from the old analog technology to the new digital technology in markets with more entry, suggesting …

We consider some two dynamic models of entry in mobile telephony, with and without strategic pricing, and taking into … account market penetration at entry, locked-in consumers and tariff-mediated network externalities. We show that on …/off-net differentials may reduce the possibility of entry if incumbents are large, while they have no long-run effects if there are no …

welfare effects of entry into residential local telephone service in New York State using household-level data from September …

In this paper, we evaluate the consumer welfare effects of entry into residential local phone service in New York State … first quarter of 2003. Our results indicate that as a result of entry households that subscribe to one of the entrants … nature of the data, we decompose the households' overall gains from entry and find that benefits due to firm differentiation …

, rarely have economists been able to examine how competition changes with the threat of entry. This paper uses the evolution … firm adjusts its entry strategy when facing the threat of additional entrants. We identify the potential entrant into a … that such a market is more likely to accommodate more than firms in the long run. Taking account of endogeneity of entry …