This article explores the supposition that international price margins in the U.S. Pacific Northwest-Japan softwood trade are influenced by nontariff trade barriers and inelastic supplies of international transportation services. Furthermore, it pursues the hypothesis that a regime separation...

Price responsiveness and preferences for wheat classes are measured using a Case function specification. Results indicate there have been numerous changes in market shares of wheat classes from different exporters in specific markets. In general, quality differentials are important in some...