An overlapping generations model of social security with productivity and demographic shocks is studied. The authors focus attention on stationary long-run allocations. An allocation is interim optimal if there does not exist another feasible allocation that improves the expected welfare of all...

A set of n objects and an amount M of money is to be distributed among m people. Example: the objects are tasks and the money is compensation from a fixed budget. An elementary argument via constrained optimization shows that for M sufficiently large the set of efficient, envy free allocations...

An effectivity function describes the blocking power of coalitions on subsets of alternatives. Given a preference profile, if any coalition blocks an alternative whenever it can, using its own power and making all of its members better off, only alternatives in the core can be reached. In this...

Mobile students and graduates react to the institutional framework of higher education and on their turn induce changes in governmental policies. In this article, we are interested in how governmental decisions about the financial regime and the quality level of higher education interact with...

An intricate web of claims and obligations ties together the balance sheets of a wide variety of financial institutions. Under the occurrence of default, these interbank claims generate externalities across institutions and possibly disseminate defaults and bankruptcy. Building on a simple model...

Interbank claims are a concern to regulators as they might facilitate the dissemination of defaults and generate spill-over effects. Building on a simple model, this paper introduces a measure of the spill-over effects that a bank generates when it defaults. The measure is based on an explicit...