If I can hire someone in Dayton for $90k or someone in Palo Alto for $150k, who do you think I'm hiring? Over time the pay will become equal, and high COL area

If I can hire someone in Dayton for $90k or someone in Palo Alto for $150k, who do you think I'm hiring? Over time the pay will become equal, and high COL areas will either stop being high COL or will no longer be where people are hired from.