I'm not seeing how this matters, they were already doing that - the market is a big auction to work out the overlap between lowest salary employees will work for and the highest salary employers will offer. In that process employees also use data to figure out the highest salary that will be offered. The thing forcing employers to pay the salary they do is that if they offer less someone else will gazump them for the employee's time. It has nothing to do with the circumstances of the employees lifestyle. The lifestyle adjusts to the salary.