Not the slackers?
You imagine that this is based on any logical supposition of ANY kind?
Your performance, your skills (and the lack of those skills elsewhere), your criticality to some multi million dollar contract and a whole raft of other very real attributes have nothing to do with it.
Factors that do have something to do with it:
1) Salary
2) Age
3) Country location
4) Building location
5) Amount of dollars required to terminate you
6) If you are below layer 4
If you are earning say over US$70k, over 45 years old, in the US but not in Planno and a mere technical expert...
More expensive to get rid of people in Europe, but not impossible if by doing so cleans out a building and lets them close it.
In low cost areas, if the client you support goes, so do you. No point in struggling to move you to another client.
It makes no sense but McKinsey know what they are doing right?