Have job openings become less potent?

In the post-recession environment, the employment-population ratio is no longer responsive to increases in job openings. This is a severe structural shift driven by a spike in the length of unemployment (see further discussion). People don’t have the skills, the mobility, or the will to fill those job openings. The problem is significantly worse than what economists have been estimating by using the official unemployment rate.

That is from Sober Look.