People always bring this up, but there are a myriad of different metrics that include all kinds of different groups, like people who want work but have given up

People always bring this up, but there are a myriad of different metrics that include all kinds of different groups, like people who want work but have given up on finding work or people who are working less but than they want to. All of those measures are highly correlated with each other and move nearly in lockstep with each other.