Depends on management style. Stack ranking companies, which used to include MS and GE) would fire 10% (theoretically the bottom 10%) every year. It's no longer

Depends on management style. Stack ranking companies, which used to include MS and GE) would fire 10% (theoretically the bottom 10%) every year. It's no longer fashionable, but there are probably some that still do this more or less. Musk does seem to believe in occasionally "trimming the fat" when the numbers get tight. SpaceX did this exact thing in 2014, and Tesla has done it recently (and is now back over the headcount post-layoffs).