They’re referring to two tier wage scales [1]. Workers hired after a certain date have worse pay and benefits, and it takes longer to earn benefits. [1] https

They’re referring to two tier wage scales [1]. Workers hired after a certain date have worse pay and benefits, and it takes longer to earn benefits. [1] https://en.m.wikipedia.org/wiki/Two-tier_system?wprov=sfti1 https://en.m.wikipedia.org/wiki/Two-tier_system?wprov=sfti1