We use a difference-in-difference estimator to examine the effects of a merger between three airline companies on two types of route: (1) on those where two low-cost carriers and (2) on those where a network carrier and one of the low-cost airlines had previously been competing. We report a...

Cartel detection is one of the most basic and most complicated tasks of competition authorities. In recent years, however, variance filters have provided a fairly simple tool for rejecting the existence of price-fixing, with the added advantage that the methodology requires only a low volume of...