In this paper we study hedonic games where each player views every other player either as a friend or as an enemy. Two simple priority criteria for comparison of coalitions are suggested, and the corresponding preference restrictions based on appreciation of friends and aversion to enemies are...

This paper discusses an aspect of computational complexity in social choice theory. We consider the problem of designing voting rules, which is formulated in terms of simple games. We prove that it is an NP-complete problem to decide whether a given simple game is stable, or not.

Stable flows generalize the well-known concept of stable matchings to markets in which transactions may involve several agents, forwarding flow from one to another. An instance of the problem consists of a capacitated directed network in which vertices express their preferences over their...

An instance of the marriage problem is given by a graph G together with, for each vertex of G, a strict preference order over its neighbors. A matching M of G is popular in the marriage instance if M does not lose a head-to-head election against any matching where vertices are voters. Every...

Our input is a complete graph G on n vertices where each vertex has a strictranking of all other vertices in G. The goal is to construct a matching in G that is "globallystable" or popular. A matching M is popular if M does not lose a head-to-head election againstany matching M': here each...

In June 2008, the European Commission (EC) was enabled to introduce a settlement procedure that aims at promoting the procedural efficiency of cartel enforcement in the European Union (EU). We use a data set consisting of 84 cartels decided by the EC from 2000 to 2014 to empirically investigate...

The paper examines the evolution of the thesis which states that the type of colonization determines, or conditions, the future of societies. Adam Smith already presented this proposition and a typology of colonies. However, it were the German authors Heeren and Roscher, in the 19th century, who...

The introduction of the European Union (EU) Settlement Procedure in 2008 aimed at promoting the procedural efficiency of cartel investigations by the European Commission (EC). We use a data set consisting of 579 firms groups convicted by the EC for cartelization from 2000 to 2015 to investigate...

Employment tribunals or labor courts are responsible for enforcing employment protection legislation and adjudicating rights-based disputes between employers and employees. Claim numbers are high and, in Great Britain, have been rising, affecting both administrative costs and economic...