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.