Useful links for PhD students:
How to get a PhD and save the world. By Chris Blattman, Yale economics
Advice for aspiring economists. By Greg Mankiw, Harvard economics
My rules of thumb. By Greg Mankiw
How to do research. MIT AI Lab
The task of the referee. By Alan JaySmith, UC Berkeley
How I work. By Paul Krugman
Incidents from my career. By Paul Krugman
Useful links for students who are considering going for a PhD:
Should I go to graduate school?