In this paper we examine whether a generalized version of Flam and Helpman's (1987) model of vertical differentiation can reconcile three facts. One, countries import only a subset of available varieties. Two, import prices vary across exporters within narrow product categories. Three, US growth...

We examine a generalized version of Flam and Helpmanacirc;euro;TMs (1987) model of vertical differentiation that maps cross-country differences in income distributions to variations in import variety and price distributions. The theoretical predictions are examined and confirmed using micro data...

Alchian and Allen show that a per unit transactions cost lowers the relative price of, and raises the relative demand for, high-quality goods. We extend their theory, deriving a relationship between per unit and ad valorem trade costs and the quality composition of trade. Detailed international...