Re: So, which is it?
"unless you're talking about the public sector."
What percentage of your tax do you want me spending on redundancy payments and recruitment charges?
As a planning benchmark, annual churn is around 9% in UK public sector, so around 45000 'new' teachers and roughly 85000 'new' nurses per year (I suspect that 'new' may include return after family break to some extent). From my PHB days (decade ago) it cost around £1400 to advertise/interview/recruit and very occasionally another £5000 or so supply/agency staff costs, the latter payable when a teacher left suddenly.
We currently have a severe shortage of teachers (many leaving profession a year or two after completing training due to workload), and a significant drop in nurses in training (loss of bursary), so actual churn currently much higher than planned.
IBM employees are caught up in a large corporation changing its business model and they have my sympathy but corporations can do that. Can't send children home too often and can't close (too many) hospitals before people start voting you out mate.