Aggregation may be harmful but cannot always be avoided in the analysis of complex econometric models. It should be carried out intelligently by choosing ein aggregative model optimally for modes of aggregation speeified in advance, i.e. minimizing the bias introduced by aggregation and...

In this paper I investigate the effect of different stages of international trade on market structure and prices when production involves overhead cost, markets are intransparent, and customers have to search for offers. I show that two stages have to be distinguished: a first stage where each...

In the analysis of endogenous growth models often projections are used which map the balanced growth path into a single point. This is done in order to draw conclusions about the stability of the system or the determinacy of transition paths. This procedure hinges on the homogeneity of the...

We address the question of competition within the location choices of firms. In a framework of agglomeration effects, both spatial and temporal dimensions of the firms' decisions are studied. We show that the competition consequences of preemptive move and optimal time of entry can interfere...

In der vorliegenden Arbeit wurde das Verhalten des Migrations-Gittins-Index, welcher im sequentiellen Migrationsmodell die optimale Migrations-"Politik" determiniert, und variierendem Risiko untersucht. Das Hauptinteresse lag auf der Frage, inwieweit sich das für risiko-neutrale Migranten...

The accuracy of U.N. population projections is examined. The goal is to measure the amount of uncertainty associated with past projections of the United Nations in order to provide a reaiistic measure of the uncertainty in the projection that the U.N. makes in the future. Various descriptive...

We study the possibility of cartel formation among primary exporters who face an inelastic world demand for their exports. By constructing an appropriate infinitely repeated export game, we show that varying country sizes will pose difficulties in sustaining the collusive behaviour.