The two sectors here are tradeables and non-tradeables (I classified whole industries... tradeables includes manufacturing, mining, etc and non-tradeables includes services, retail/wholesale, etc)
High skill is defined as having greater than 12 years of schooling.
For the early 70's versus the early 90's, decompose total changes in high skilled employment into within and between sector changes
What does this decomposition tell you about the relative importance of globalization and technology in explaining increasing wage gaps between high and low skilled workers?
What might be wrong with this story? How could within changes be due to globalization?