Even assuming that you had an identical prior on the two candidates, the information that one person was willing to do a job for half price would make me doubt his intelligence.
If in some artificial scenario, I had to blind hire one of two candidates with functionally identical resumes, where one asks for market value, and the other asks for half market value, yeah, I take the higher salary..
Even assuming that you had an identical prior on the two candidates, the information that one person was willing to do a job for half price would make me doubt his intelligence.