This paper studies the existence of equilibrium solution concepts in a large class of economic models with discontinuous payoff functions. The issue is well understood for Nash equilibria, thanks to Reny's better-reply security condition ( Reny 1999) and its recent improvements (Barelli and...

The serious deficiencies of majority voting in both theory and practice are shown via recent experimental results. The fact is that the winner of an election is highly dependent on minor candidacies and is not only the outcome of the electorate?s will (Arrow?s paradox). A remedy is proposed :...

Cet article met en évidence les lacunes du scrutin majoritaire à un ou à deux tours en théorie et en pratique, se reposant sur l'histoire récente des élections présidentielles françaises et de résultats expérimentaux. Et il propose un remède : plus d'information doit être demandée...