It is generally accepted that moving from an unfunded to a funded social security system implies a welfare loss for the trasition generation, that is the generation that has to pay twice: first, saving for this own retirement and second, contributing to the pensions of the then retired...

In a two period model with asymmetric information the authors study the optimal antitrust policies carried out by a pulbic agency faced with firms' horizontal price-fixing behaviour. They analyse the effect on social welfare in case the Antitrust Authority decides to bind itself to follow the...

In this survey we address three of the principle algebraic approaches to integer programming. After introducing lattices and basis reduction, we first survey their use in integer programming, presenting among others Lenstra's algorithm that is polynomial in fixed dimension, and the solution of...

This paper develops a posterior simulation method for a dynamic tobit model. The major obstacle rooted in such a problem lies in high dimensional integrals, induced by dependance among censored observations, in the likelihood function.

We consider a continuum of unemployed workers ranked according to their unemployment duration. There are two industries, a high and a low technology one, which compete imperfectly on the labor market. Once employed, each individual must bear a training cost, which is proportional to his...

This paper presents an amenity-based theory of location by income. The theory shows that the relative location of different income groups depends on the spatial pattern of amenities in a city.