dont see anything wrong with that. it's a free market and this is one of the practices that will ensure competitive offers of wages. it is a known fact that most companies seek to suppress remuneration packages (to maximise profit) and job seekers are already at a disadvantage for a lack of a transparent environment.
at the end of the day, the company could walk away if they feel that the candidate is not worth a 'higher bid'. that is also the risk that the candidate bears. it's par for the course and i dont see any ethical issues arising at all.
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