We study personalized price competition with costly advertising among n quality-cost differentiated firms. Strategies …

. Finally, consumer gains from competition depend on how well informed they are and turn out to be larger for relatively …

instrumenting is particularly important for estimating the effect of competition on the markup of the price leader. …

countervailing power, via an increase in downstream concentration, typically lowers landing fees, but depends on the competition … downstream competition is in quantities, but if downstream competition is in prices landing fees fall only where airports cannot … discriminate. Furthermore, only in a specific case (Bertrand competition, uniform landing fees and undifferentiated goods) will …

We study the effect of entry on costs and competition in the Portuguese mobile telephony industry. We construct and … effort. We show that failure to account for cost reducing effort leads to biased estimates of competition in the industry. We … significant cost reductions, and fostered competition. …

differentiation. An increase in concentration is more likely under Cournot competition if products are complements and more likely … under Bertrand competition if products are substitutes. Moreover, as products become closer substitutes, a takeover becomes … more likely under Bertrand and less likely under Cournot competition. …