In a negotiation like this where you know you're being lowballed, I think it's better to just state your case (including preferred figures) and then walk rather

In a negotiation like this where you know you're being lowballed, I think it's better to just state your case (including preferred figures) and then walk rather than go back and forth for days on end. If the market rate that people like you and with your level of experience are generally being hired at is higher than the offer, why not walk away and get one of those offers instead?