Rather than restricting the ability of people to talk about their salaries with others, the exact opposite should be the case: Any worker should have the right to go into HR and demand to know the compensation package of every other employee in the firm from the CEO on down.

How on earth are you possibly supposed to know if you're being fairly compensated if you aren't allowed to gather the information to show you what to expect?

"But employee morale!" What about it? If people are going to get upset because other people are making more than them, then they need to be talked to by HR about why their salary is not the same as the others. Because if it turns out that something is wrong, it can be caught right then and there and corrected rather than letting it fester and become a sore point when it is finally discovered later.

It's called "transparency."

I fully agree with the value of posting but for a different reason. People use the phrase "labor market" but there are so many restrictions on how we sell our labor that it cannot possibly be compared to how one buys wheat or tube socks. In other markets we expect prices to be listed for labor that is regarded as tacky. In other markets we expect competition to lower prices - if I went to a company and offered to perform a job for 80% of what the present job holder made I would be regarded as weird. I usually cannot work for two competing companies half-time each but wholesalers can sell goods to two competing retailers. What is bad is that the same people who say the free market is holy do not support making the labor market free for both sides of the exchange.