We show that it is possible to incorporate any appropriation technology available to thieves into a Walrasian economy so that in equilibrium more police induces more crime. This perverse effect could arise even if the level of police protection is the socially optimal one

It is possible to partially order cities according to the informativeness of neighborhoods about their ethnic groups. It is also possible to partially order cities with two ethnic groups according to them Lorenz criterion. We show that a segregation order satisfies four well-established...