honest question, because it's something I don't understand well. is it possible the quantity of job openings can mask the quality of jobs openings? if job openings at fast food restaurants goes up 1000% maybe this isn't positive
But the statistics are selected in a way that if a society maintains a low headline unemployment for a long time, it's correlated to an increase in the quality of the jobs¹. The correlation is still not perfect, and authoritarian countries love to redefine the date so their absolute value changes.
1 - More clearly, a constant low unemployment correlates to a positive derivative in quality. And a constant high unemployment correlates to a negative derivative in quality.
https://fred.stlouisfed.org/graph/fredgraph.png?g=1Q95B&heig...