To see if you repost it with a lower salary if you get the same amount or fewer applicants and if there is a difference in applicant quality. It provides some insight into labor market.
replies(2):
You can see from the application data that each role that's been reposted already has hundreds of applicants, which implies that it did last month as well.
Why would you repost a role vs just going through the 1000 applications you received last time?
What is the reasoning there?