>Part of the negotiating power is being good enough at what you do for your skills to be in demand, and having resources or alternatives to fall back on if company is not willing to agree to a part time arrangement.
but that's the thing: there aren't many jobs past entry level that even give such an option for part time. Consulting is the closest factor but even than can have some strict time requirements (too strict at times).
So for (I wager) 90+% of people, the only fallback is "I can quit and never work a day in my life again" sorts of situations. That or you are playing some high stakes career haggling should the employer decide to try and train a replacement that will work full tim.
but that's the thing: there aren't many jobs past entry level that even give such an option for part time. Consulting is the closest factor but even than can have some strict time requirements (too strict at times).
So for (I wager) 90+% of people, the only fallback is "I can quit and never work a day in my life again" sorts of situations. That or you are playing some high stakes career haggling should the employer decide to try and train a replacement that will work full tim.