This paper shows that the possibility of collusion between an agent and a supervisor imposes no restrictions on the set of implementable social choice functions (SCF) and associated payoff vectors. Any SCF and any payoff profile that are implementable if the supervisor's information was public...

Inequality is bad per se and has adverse effects, among other things, on economic development and the environment. It is also often argued that high and increasing inequalities put societies under stress, which increases the likelihood of social conflicts. However, the literature on this topic...