EDIT: to expand on my point, in metropolitan areas that are experiencing a population boom, demand creates opportunities for businesses, and therefore opportunities for prospective workers. It's a virtuous cycle. Meanwhile, a large employer's departure in established areas will leave behind skilled talent, but some of those people will depart and disperse, making the area less attractive for new job creation in related fields.
Their main industry is RV manufacture. When the economy is rocking, RV sales go up, the Elkhart has a big lack of workers. When the economy is rubbish, they all get laid off and move elsewhere.
The metro area here has over 550,000 people. Not New York City, bit big enough that there SHOULD be enough glass installers, or at least a pool to train enough glass installers form.
More common, it is things like hail during thunderstorms or gravel from a road.
1) Inadequate pay.
2) Unwillingness to train.
If you don't have the exact skills that the company wants, they won't hire you. But they will complain that they can't find anyone even though they are really only offering unskilled level wages.
If you're 30/40, odds are you have a family, roots somewhere, and maybe a mortgage. Your ability/willingness to move - especially after being out of work for a while - is near zero.
* I'm late 30s with all of the above.
This is also true for someone like me as a recent grad with an older vehicle, a student loan to pay off, and lack of sufficient savings to move too far away from my hometown. One of the large issues of the education crisis that I don't hear being discussed is that a lot of students, like myself, often spend literally everything we have to get the degree after constantly hearing about success story after success story in the K-12 system. In these cases, it is implied that college is the only way to get ahead in life and we need to get there by any means necessary.
I mean, how the hell am I supposed to magically relocate halfway across the country (or even commute >50 miles away from my house on a daily basis) when the infrastructure doesn't exist and/or no benefits are offered besides "you should be glad that we're even paying you"?
But hey, I'm just a whiny millennial brat who should be glad that spanking/belt whipping is illegal.
4 years job experience and college degree required for entry-level job.
No training.
"We can't find anyone"
1: http://kff.org/report-section/kaiser-family-foundationcnn-wo...
http://data.bls.gov/timeseries/LNS11300000
It's only 5 million people or so, so I guess you're saying that's not "big".