WHAT EXPLAINS THE 2007–2009 DROP IN EMPLOYMENT？
http://www.umass.edu/preferen/You%20Must%20Read%20This/Mian%20Sufi%20NBER%202014.pdf

Why doesn't thechnology flow from rich to poor countries ?
https://files.stlouisfed.org/files/htdocs/wp/2012/2012-040.pdf