This paper examines the roles of quality and increasing returns in trade. It implies that there is intense intra-industry trade among economies with similar levels of per capita income, which increases both the quality and the quantity of consumption. However, there may be no trade in...

We study the joint role of altruism and impatience, and the impact of evolution in the formation of long-term time preferences and in the determination of optimal consumption and optimal bequests. We show how the consumption paths of dynasties relate to altruism and to impatience, and we reason...