I've only worked at GAFAM (GAMAM now?) and I'd say half the people I have worked with have stayed longer than 4 years at the same company past the 4 year cliff.

I've only worked at GAFAM (GAMAM now?) and I'd say half the people I have worked with have stayed longer than 4 years at the same company past the 4 year cliff. I think it probably is actually cheaper to focus on recruiting to get the half who job hop while letting the other half be complacent.