I read about someone who described his own salary negotiation: he writes the minimum salary he's willing to take, the recruiter writes the maximum they're willi

I read about someone who described his own salary negotiation: he writes the minimum salary he's willing to take, the recruiter writes the maximum they're willing to pay , then you show your numbers. If minimum > maximum, call it a day otherwise you continue the negociation. His trick was to write a minimum of 0 as in if you're not satisfied with his job he won't take your money, supposedly he got much better offers doing the negociation this way, probably because he gets the other party to give a number much higher than what they would otherwise have said. Also it may have been for contracting work and not an employee position. (Can't remember where I read this, probably on hn though).