We give variants on Berge's Maximum Theorem in which the lower and the upper semicontinuities of the preference relation are assumed for two different topologies on the action set, i.e., the set of actions availabe a priori to the decision-maker (e.g. a household with its consumption set). Two...

We model organization as the command-and-communication network of managers erected on top of technology (which is modelled as a collection of plants). In our framework, the role of a manager is to deal with shocks that affect the plants that he oversees directly or indirectly. Organizational...

Classical theories of exchange rates, such as Mint Par and Purchasing Power Parity (PPP), have the desirable property that they define a network of exchange rates in which no profit by 'compound arbitration' or 'cyclic arbitrage' is possible. Conversely, it will be shown that any network of...

This paper studies the impact of lobbying on political competition and policy outcomes in a framework which integrates the citizen-candidate model of representative democracy with the menu-auction model of lobbying. Positive and normative issues are analysed. On the positive side, lobbying need...