Nice interview of Prof Joshua Angrist of MIT:
As a teenager growing up in Pittsburgh, Joshua Angrist became fed up with high school and said his goodbyes to it after his junior year. Today, at the Massachusetts Institute of Technology, he’s a top researcher in labor economics and the economics of education — with work that includes a series of famed studies of policy choices for K-12 schooling.
Much of his work has been based on ingenious “natural experiments,” that is, episodes in which two or more groups of people were randomly exposed to different policies or different experiences. Such occurrences are an opportunity for Angrist and his co-authors to use the tools of econometrics to assess the effects of those differences — whether that’s a large classroom versus a small classroom or education at a charter school versus education at a conventional public school.
Angrist’s first natural experiment looked at labor market outcomes for men who were drafted during the Vietnam War era compared with those of men who weren’t drafted. The idea came to him from his labor economics teacher and Ph.D. adviser at Princeton, Orley Ashenfelter, who mentioned in class one day that he had seen a news article about a study in the New England Journal of Medicine in which epidemiologists investigated the long-term health effects of being drafted.
“They had done this very clever thing where they used the fact that draft lottery numbers were randomly assigned,” Angrist remembers, “and they compared people who had high and low numbers to test the causal effects.”
Ashenfelter remarked to the class that this use of the draft lottery was a great idea and that somebody should use it to look at the effects of the draft on the men’s earnings. Angrist agreed; immediately after class, he went to the library to start the research that became his doctoral thesis.
Angrist found that in the early 1980s, well after the end of the war, veterans — whether they served in Vietnam or elsewhere — took an earnings hit of around 15 percent compared with non-veterans in the same period. (Angrist himself served as a paratrooper in the Israeli army before he went to grad school.)
In addition to his research and teaching responsibilities at MIT, Angrist is a co-founder and co-director of MIT’s School Effectiveness and Inequality Initiative. He is the author, with Jörn-Steffen Pischke, of the econometrics textbooks Mostly Harmless Econometrics: An Empiricist’s Companion (2009) and, for undergraduates, Mastering ‘Metrics: The Path from Cause to Effect (2015). He also teaches econometrics in a series of free videos offered through the nonprofit Marginal Revolution University.
How he came into economics? It is all about getting one good teacher!
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