Earlier quoted context omitted.
There's lots of evidence out there. Probably the most obvious signal for you should be that companies are complaining about a lack of workers, but wages are stagnant. Or another signal might be the fact that 50% of STEM grads have to work in unrelated industries because of an inability to find work in tech. If you want more proof of funniness: https://www.youtube.com/watch?v=TCbFEgFajGU Or if you want proof of major…
Do you have a citation for "50% of STEM grads have to work in unrelated industries because of an inability to find work in tech"? Many STEM graduates choose not to work in tech, for example math majors who go into finance, or chem majors who go into consulting. And, many STEM grads are not actually qualified to work in tech. A BS in biology is certainly a STEM degree but that person is not likely to help scale your R…
http://eric.ed.gov/?id=ED498867
"Purported labor market shortages for scientists and engineers are anecdotal and also not supported by the available evidence"
"the education system produces qualified graduates far in excess of demand: S&E occupations make up only about one-twentieth of all workers, and each year there are more than three times as many S&E four-year college graduates as S&E job openings"
This article links to a bunch of other papers:
http://spectrum.ieee.org/at-work/education/the-stem-crisis-i...
"The departure of STEM graduates to other fields starts early. In 2008, the NSF surveyed STEM graduates who’d earned bachelor’s and master’s degrees in 2006 and 2007. It found that 2 out of 10 were already working in non-STEM fields. And 10 years after receiving a STEM degree, 58 percent of STEM graduates had left the field"
Some data from the economic policy institute (this is the first place i could re-find it): http://www.rit.edu/news/pdfs/CHE_Hira.pdf
Of the 50% of engineering graduates not working in engineering, 40% of CS grads not in CS, (35% total are working in totally unrelated fields), ~50% are not working in their fields because of pay and conditions, 37% are not working in their fields because they can't find work, and 10% are not working in the field for another reason. The 37% probably aren't the people who moved into management consulting.
Certainly some STEM grads may not be qualified to work in tech, but i'd argue that a biology major would easily adapt to working in the average web development shop. And certainly a mathematician or engineer would (obviously).
Lastly, there's a large supply of unemployed CS graduates in the US: http://www.epi.org/publication/pm195-stem-labor-shortages-mi...