10) The denominator of (10. Feenstra, Advanced International Trade 4-3 gaining widespread acceptance among trade economists,5 and no graduate trade course today is complete without a discussion of this topic (I think the same is true at the undergraduate level). Fortunately, the tools we have developed in the previous chapters can be readily extended to deal with trade in intermediate inputs. After reviewing the initial evidence concerning the change in wages for the U. We make the key assumption that cm < cf + t.