In this paper, we are going to reconsider the standard Viner Model [Viner, 1950] however under the premise of firm heterogeneity. By means of a graphical analysis we show that a consideration of the degree of firm heterogeneity is important for an evaluation of a preferential trade agreement....

Recently, discussion about the appropriate estimation of gravity trade models has started in agriculture. Here, we are going to review recent developments in the literature. It appears that fixed effects Poisson Pseudo Maximum Likelihood is not only the only consistent estimator [Santos Silva...

With the extension of the standard Melitz Model from Ahn et al. [2011], the important role of intermediaries in facilitating trade is now recognized. In this paper, we are going to expand Chaney's [2008] approach to an Intermediate Melitz Model. By researching if Chaney's results still apply for...

In this thesis, so far insufficiently considered characteristics of long-run equilibriums in food markets are investigated. For this purpose, multivariate time series methodologies, which were developed for the estimation of long-run relationships by allowing for causality and convergence, are...