The real important question is the subsequent one:
— What are your salary expectations?
— $X
— Ok! That means if we propose Y, would you envision it?
— Yeah, maybe, because I’m out of choice / No because I already have an offer at $X-1.
Source: I’m hiring (and yes, Y enters into consideration because most candidates overestimate their skills, but I always go for X if the candidate is as expected).
In reality most candidate are just bad at estimating their own skills (in both directions) and of course they know almost nothing about the match between the skills and the position.
— What are your salary expectations?
— $X
— Ok! That means if we propose Y, would you envision it?
— Yeah, maybe, because I’m out of choice / No because I already have an offer at $X-1.
Source: I’m hiring (and yes, Y enters into consideration because most candidates overestimate their skills, but I always go for X if the candidate is as expected).