I think the biggest evidence of the bubble can be seen in job postings. When there is little diversity in skills being asked for that is a very dangerous position for a sector. Imagine a town where every job posting was related to the horseshoe industry with Henry Ford approaching in the horizon. Not only would there be little available for new work after a disruption, there is little available for you at the moment to get experience in some different framework.

To say nothing at all about what the white house is doing which makes everything more precarious as companies get flighty due to economic instability.