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...

If agents negotiate openly and form coalitions, can they reach efficient agreements? We address this issue within a class of coalition formation games with externalities where agents' preferences depend solely on the coalition structures they are associated with. We derive Ray and Vohra's (1997)...

Ben-Porath (1997) characterizes the strategies consistent with common certainty of rationality (CCR) and the origin of a generic game of perfect information. More generally, the notion of "weak extensive form rationalizability" (weak EFR) captures the implications initial CCR in an extensive...

We test the Average Credible Deviation Criterion (ACDC), a stability measure and refinement for cheap talk equilibria introduced in De Groot Ruiz, Offerman & Onderstal (2011b). ACDC has been shown to be predictive under general conditions and to organize data well in previous experiments meant...

This discussion paper resulted in an article in <I>Economics Letters</I> (2007). Vol. 96, pp. 316-324.<P> The Nash bargaining solution of a modified bargaining problem in the contract space yields the pair of stationary subgame perfect equilibrium proposals in the alternating offers model, also for...</p></i>

This discussion paper resulted in a publication in <I>Games and Economic Behavior</I> (2014). Volume 86, pages 77-95.<P> Minority games are a stylized description of strategic situations with both coordination and competition. These games are widely studied using either simulations or laboratory...</p></i>

I study a one-way flow connections model in which players are heterogeneous with respect to values and the costs of establishing a link. I first show that values and costs asymmetries are crucial in determining the level of connectedness of a network. Interestingly, unconnected equilibria are...

This discussion paper resulted in a publication in <A href="http://link.springer.com/article/10.1007%2Fs11238-010-9196-5">'Theory and Decision'</A>, 2011, 71(2), 269-295.<P> Unique-lowest sealed-bid auctions are auctions in which participation is endogenous and the winning bid is the lowest bid among all unique bids. Such auctions admit very many Nash equilibria (NEs) in...</p></a>

This discussion paper resulted in a forthcoming article in the <I>Journal of Economic Behavior & Organization</I>.<P> This paper characterizes the set of equilibrium networks in the two-way flow model of network formation with small decay, and this for all increasing benefit functions of the players. We...</p></i>

This discussion paper led to a publication in <A href="http://www.sciencedirect.com/science/article/pii/S0095069611001380">'Journal of Environmental Economics and Management'</A>.<p>Water markets with market power are analysed as multi-market Cournot competition in which the river structure constrains access to local markets and limited resources impose capacity constraints....</p></a>