> A competitor wants to hire away 100 of them and offers them an enhanced salary. They only need to offer that to 100 people, but to stop them getting any of th

> A competitor wants to hire away 100 of them and offers them an enhanced salary. They only need to offer that to 100 people, but to stop them getting any of those 5000 employees you have to offer a competitive package to all of them. I don't think this is true as (I think) you're assuming that all 5000 employees are equally skilled and desired. More realistically, the poaching company wants the more senior/experienced so TSMC only has to watch out for these. Still not an insignificant number nor amount of money. Long-term, the solution is probably for companies to focus more on building their culture and focusing on the non-financial perks (e.g. ala Google) so employees will think twice about leaving.