[gwbas1c]

In the US, it's generally considered important to the economy that employees have good job mobility. There's plenty of stories of awful employers / managers; so job mobility is generally considered how workers protect themselves.

In general, because workers can pretty much leave whenever they want, employers need to make sure there's good financial incentives and good working conditions. Some employers will provide things like retention bonuses, stock plans tied to staying employed for a certain length, or other incentives that employees give up when they quit.

As far as a mandatory 3 month notice period: As an American, the few times I've been in a "bad" job, I've just wanted to leave. A 3 month period would just make me miserable. I'd rather have some kind of financial incentive to stay to a certain date.

[lmarcos]

If you get fired in Switzerland, your employer gives you a notice period of 3 months as well. Which is nice because it's plenty of time to find another job.