Why are people slaves in 9 to 5 jobs?

I do not mean that they are wage slaves. I work a 9 to 5 too. But they are so obedient for 3% annual raises. Even if I don’t get those raises because I do the bare minimum, I keep my energy for my second source of income and I make more than them.

Why are people slaves in 9 to 5 jobs?
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