I am teaching International Trade this semester and there are two models of trade that are important to teach, but there weren’t any resources that teach all the main intuitions without excessive complexity so I wrote my own “textbook” chapters to teach about a:
Model economy if people can’t change jobs
And the ever important:
Heckscher-Ohlin (H-O) model with physical capital
I’ll add more links to resources for international trade here, but I don’t intend to post most of this stuff on my blog because it is too wonkish for casual readers!
Update: The cost disease of services is easy reading!
Medianism 
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