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Seems like working for someone is a consensual choice that ought be regulated by the free market itself.It's because the free market is a myth, and what actually exists is all kinds of forces playing against each other, using influence, media, money, laws, and the government for their purposes.
Now, the most powerful forces are those of the people with (m/b)illions in the bank, expensive layers, friends in high places and the ability to move their operations wherever they want, and those are rarely people looking for work -- rather they the people looking for employees.
Which is why laws are required. Because a democratic government represents each person equally -- each has one vote, regardless of their wealth (again in theory, like there's no free market, there's also no actual democratic government). So it serves as a counter-balance between small people and big people/coprs (governments can be in bed with big people/corps but they need to pander to small people too in order get their vote).
Add to that, the fact that without any government at all, you don't get anywhere close to a free market either.
At best you'll get the heavier players doing everything they like -- and having private armies and thugs enabling them, to which regular people can just suck it and play along.
This has been the case in some places in developing countries for example, where, while there nominally a government exists, it's so in the pockets of the local moguls that it's just like their private mercenary enforcement force.
>Some guy might not care about 30 days vacation but might prefer more money, as an example.
Without any kind of legal pressure, guys and gals are gonna get neither "30 days vacation" nor "more money".