TL;DR: employers want to say that sharing the salaries is counter-productive (because employers want the freedom to set unfair salaries).<p>Employees are generally happier and hence more motivated when the salaries are fair.<p>Employees are generally less happy and hence less motivated when the salaries are unfair.<p>Feels like it shouldn't require advanced research "from Indiana University, Harvard Business School and the University of California" to realize that :).