Suchergebnisse

In spite of the fact that in recent years there has been a growing interest for the hidden economy, little attention has been lent to its relation with the illegal immigration as a consequence of the establishment of quotas. The objective of this work is to analyze the effect of a change in the quotas of legal immigrants in the size of the legal and illegal migration, the underground economy, and in the incomes perceived by the workers. The main conclusions are that, as opposed to the short time, in the long-term equilibrium, an increment of the quota does not have effect on the size of the migration, but in the composition between legal and illegal. On the other hand diminishes the work destined to the management of the underground economy by the reduction of illegal immigrants in the stationary state, however the effect is positive in the short run by the "called effect" of illegal immigrants that carries an increment in the quota.

In this paper, an analysis is made of the evolution of Spanish urban structure during the period 1900-99. It is postulated that the size distribution of the cities follows a Pareto distribution, which is estimated on a yearly basis. At the same time, the hypothesis is adopted that the intradistribution dynamics can be modelled by means of a Markov chain. In this way, are deduced the so-called transition matrix and its associated vector or ergodic probabilities. This methodology allows two main results to be obtained. First, this evolution has not been homogeneous ; there has been a divergent pattern of growth during the period 1900-70; and a convergent pattern for the period 1970-99. Secondly, the intradistribution movements in the Spanish urban hierarchy have been very significant during the course of the 20th century. In addition, the existence of spatial correlation has also been detected for those cities that have either entered or exited from the sample of the 100 largest cities during the course of the century.

In this paper, we present an extension to Krugman's core-periphery model-namely, the introduction of the public sector as a new economic agent. There are two main results: first, we demonstrate theoretically that regions with a lower tax-burden in net terms, in the sense of having lower taxes and/or higher levels of public efficiency in their management, offer greater incentives to attract economic activity; secondly, the influence of the transport costs on the equilibria is not monotonous, as under the original approach, but now depends on its size, reflecting a strong interdependence between all the parameters of the model.