Making sense of unsigned free agents

For years now, it has been clear to many people around the game that baseball is in the midst of a salary bubble … and eventually that bubble is probably going to burst. The bubble burst might be what we’re seeing now with the collection of very good ballplayers — J.D. Martinez, Eric Hosmer, Yu Darvish, Lorenzo Cain, Jake Arrieta, Mike Moustakas, etc. — still looking for their club even as Spring Training looms barely a month away.