Why do some countries join the EU earlier than others, why do others wait? In order to answer this question we apply the theory of investment under uncertainty (Dixit and Pindyck, 1994) to the decision on EU-membership. We develop a simplified model of two periods to study how the value of...

Welfare gains from increasing product variety are an important source of the gains from international trade. Recent empirical studies have largely focused on measuring the gains from an increased variety of imports. Trade theory, however, suggests that international trade heavily affects the...

This paper examines the unprecedented decimation of sharks. We develop a Ricardian Gordon-Schaefer model with a continuum of heterogeneous species which are subject to combined harvesting and perfect substitutability in consumption. The model implies that slow-growing species, surviving in...