Originally Posted by N1234

There are two aspects to globalization - at least the way I understand it.

Coverage - PBS needs to assign an average line credit. As it moves down the list, there will be worse and worse pairings available. At some point PBS can simply not build a legal line any more with what is left in the pool and satisfy the other constraints like minimum days off, max in seven etc.

At this point it could just award a composite line or less than average line credit line - or it goes Robin Hood picking pairings from folks senior to make the junior line work out (and in turn assign less desirable pairings to the senior guys)

Aggregate "Satisfaction" - PBS also tries to achieve a global optimum in terms of line satisfaction. Not sure that is the offical term but that's probably the best way to describe it.

Let's assume a simple example with only two lines.

Line 1 (senior) has only pairings from layer 1.
Line 2 (junior) has only pairings left from layers 6 and 7

Let's assume that you switch out one or two pairings from line 1 and and instead of assigning layer 1 pairings assign two layer 4 pairings. And let's furrher assume that this will give enough flexibility to get Line 2 to come up wioth a solution of say layer 2, 3 and 4 pairings instaed of 6 and 7 only.

Then this solution would be preferred by PBS becaus the aggregate satisfaction for lines 1 and 2 is considered higher.

Basically, senior line gets scr ... a little bit but junior line benefits disproportioanlly more than senior got scr ...

The issue is that there is nothing you can really do about it w/o dis-abling "globalization"