We consider the problem of regulating a monopolist with unknown costs when the regulator has limited funds. The optimal regulatory mechanism satisfies four properties. The first property is bunching at the top, that is the more efficient types produce the same quantity irrespective of their...

We characterize all anonymous VCG mechanisms by using queue efficiency, strategyproofness and equal treatment of equals. By additionally imposing independence axioms, introduced by Chun (2006a) and Maniquet (2003), we characterize the pivotal and the reward-based pivotal mechanisms in the class...

We revisit the comparison between Bertrand and Cournot competition in a symmetric differentiated oligopoly where each firm maximizes a weighted average of its own profit and welfare. Under very general specifications, Bertrand competition yields higher prices and profits, and lower quantities,...

Subgroup additivity requires that a rule assigns the same expected ‘relative’ utility to each agent whether an agent’s expected relative utility is calculated from the problem involving all agents or from its sub-problems with a smaller number of agents. In this paper, we investigate its...

We study the dynamics of the “Kolkata Paise Restaurant problem”. The problem is the following: In each period, N agents have to choose between N restaurants. Agents have a common ranking of the restaurants. Restaurants can only serve one customer. When more than one customer arrives at the...

We present an alternative proof of Fishburn’s (1975) axiomatization of lexicographic preferences. The essence of our proof lies in identifying “an extremely pivotal factor”. Our proof reconfirms the strong interconnections between Arrow’s and Gibbard–Satterthwaite’s theorems with...

We investigate the implications of egalitarian equivalence (Pazner and Schmeidler in Q J Econ 92:671–687, <CitationRef CitationID="CR31">1978</CitationRef>) together with queue efficiency and strategyproofness in the context of queueing problems. We completely characterize the class of mechanisms satisfying the three requirements. Though...</citationref>