“In 1970, only 1 in 100 taxi drivers and chauffeurs in the U.S. had a college degree, according to an analysis of labor statistics by Ohio University’s Richard Vedder, Christopher Denhart and Jonathan Robe. Today, 15 of 100 do. Similarly, in 1970, only about 2 percent of firefighters had a college degree, compared with more than 15 percent now, Vedder and his colleagues found. And, according to research by economists Paul Harrington and Andrew Sum of Northeastern University, about 1 in 4 bartenders has some sort of degree.”

http://www.bloomberg.com/news/2013-06-25/why-are-so-many-college-graduates-driving-taxis-.html

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