[_m8fo]

Transparency aside, I've seen little evidence that employers can properly measure the exact value an employee adds to their organization.

The reason for most of these problems lies there. If employers could solve that there wouldn't be any problem. However, since that isn't the case, employees can take advantage of the opaqueness.

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Case and point: if you could measure the value, you could figure out what is valuable, and if you can figure out what's valuable and what qualities it takes to create said value then your organization would already be successful.

[neilwilson]

If the information is available to all the function of the labour market will force the value to the correct figure.

It's not a matter of individual firms. It is a matter of individual firms interacting with a functional market.

[_m8fo]

I disagree. What's valuable, and therefore compensation, is a matter of opinion, not fact.