This paper shows that generators exercised increasing market power in the England and Wales wholesale electricity market in the second half of the 1990s despite declining market concentration.It examines whether this was consistent with static, non-cooperative oligopoly models, which are widely used to model electricity markets, by testing the static Nash equilibrium assumption that each generator chose its bids to maximize its current profits taking the bids of other generators as given. It finds a significant change in behavior in late 1996. In 1995 and 1996 generator behavior was consistent with the static Nash equilibrium assumption if the majority of their output was covered by financial contracts which hedged prices. After 1996 their behavior was inconsistent with the static Nash equilibrium assumption given their contract cover but it was consistent with tacit collusion.

Commercial radio stations and advertisers have potentially conflicting interests about when commercial breaks should be played. This paper estimates an incomplete information timing game to examine stations' equilibrium timing incentives. It shows how identification can be aided by the existence of multiple equilibria when appropriate data are available. It finds that stations want to play their commercials at the same time, suggesting that mechanisms exist which align the incentives of stations with the interests of advertisers. It also shows that coordination incentives are much stronger during drivetime hours, when more listeners switch stations, and in smaller markets.

This article shows that mergers between close competitors in the music radio industry lead to important changes in product positioning. Firms that buy competing stations tend to differentiate them and, consistent with the firm wanting to reduce audience cannibalization, their combined audience increases. However, the merging stations also become more like competitors, so that aggregate variety does not increase, and the gains in market share come at the expense of other stations in the same format. The results shed light on the effects of mergers and, more broadly, on how multiproduct firms may use product positioning as a competitive tool. Copyright (c) 2010, RAND.

A bidding process can be organized so that offers are submitted simultaneously or sequentially. In the latter case, potential buyers can condition their behavior on previous entrants' decisions. The relative performance of these mechanisms is investigated when entry is costly and selective, meaning that potential buyers with higher values are more likely to participate. A simple sequential mechanism can give both buyers and sellers significantly higher payoffs than the commonly used simultaneous bid auction. The findings are illustrated with parameters estimated from simultaneous entry USFS timber auctions where our estimates predict that the sequential mechanism would increase revenue and efficiency.

Sellers of perishable goods increasingly use dynamic pricing strategies as technology makes it easier to change prices and track inventory. This paper tests how accurately theoretical models of dynamic pricing describe sellers' pricing behavior in secondary markets for event tickets, which are a classic example of a perishable good. It shows that some of the simplest dynamic pricing models describe seller behavior very accurately, and they explain why sellers cut prices dramatically, by 40% or more, as an event approaches. The estimates also imply that dynamic pricing is valuable, raising the average seller's expected payoff by around 16%.