supply-and-demand: nonreplaceability = value = competitive = more scarce, etc. etc.
I've said it before. Very few workers pay rates are based on the quality of their work or their unique skill.
This is mostly incorrect -- in general they are paid according to skill and performance. However, you can name some other factors too. And there are factors which are ambiguous, such as their personalities, likeability, who they know, their status or class standing, etc. These other factors may be partly artificial, but there's no way to dictate to the employer what the legitimate factors are. Some factors may be subconscious, and you might have to interrogate the employer intensely, shining a bright light into his eyes and beat the truth out of him -- to expose why he really preferred that particular applicant over another. In some cases it was the pretty face or the sexy (female?) body. Etc. So obviously there are many other factors, some of which might not be detectable.
It would be pointless to try to isolate ALL the factors and force every employer to be totally impartial and judge each applicant on legitimate factors only. So of course you can claim there are other factors.
Professional sports is probably one of the few areas that buck that trend and even then most of the players with the standard union contracts are still the lowest paid of those.
Workers are paid based on how easily they can be replaced. Nothing more.
What else could there be? Replaceability is essentially about "quality of their work or their unique skill."
What is replaceability? Why is someone more easily replaced than another? Precisely because s/he is less valuable, or their skill or work is less valuable. Or, they're more difficult to replace because they're more valuable. Because higher supply = less value, and lower supply = more value. It's both the demand for something plus the scarcity of it which makes it more valuable.
more "value" = less replaceability
They're essentially the same thing. It's because they're more valuable that they're more difficult to replace. The demand and scarcity are almost interchangeable. I.e., because it's more valuable, it's more difficult to find, i.e., because it's difficult to produce value, or to make oneself more valuable, making the more valuable ones also more scarce, as they get chosen and removed from availability, whereas those of less value are easier to find, or are more available.
Workers are paid based on how easily they can be replaced. Nothing more. The value of the work they do means nothing.
This is a simple contradiction, and nonsensical. Because more replaceable means precisely less valuable (or to have less value). And less replaceable means precisely to have greater value.
Lower-paid worker replaces higher-paid worker
When this happens, the lower-paid worker is more valuable, and this is why the higher-paid worker is replaced. The value of the worker is not determined by the wage paid, but by the work done, or performance.
So the lower-paid worker is more valuable, at the moment s/he replaces the higher-paid worker. When the replacement takes effect, the higher-paid worker no longer exists, because from that point on that (formerly) higher-paid worker is producing nothing = no value. After the replacement, there is no higher-paid worker left, but only the lower-paid worker. The higher-value (but lower-paid) worker now does the same work for the economy as the replaced worker had earlier performed, but at lower cost. So that lower-paid worker causes more value or production to take place, because that cost savings goes to producing other value, or additional value which before was not being produced.
replacement =
more total value now than before as a result of the work.
So the total value produced INcreases as a result of replacing the higher-paid worker with the lower-paid worker -- the same as if the higher-paid worker was
replaced by a machine which does the job cheaper. The replacement of the worker by something which does it cheaper results in more total value taking place, even if the replacement does the same work as before, because this replacement saves on cost, and that cost savings then goes into something else of value, so that the total value increases as a result of the replacement.
In some cases the replacement leads to an INCREASE in the same work done as before = more value produced, but it can also lead to the same work done as before (NO increase) but also a cost savings, and then this cost savings translates into additional value elsewhere, so that the replacement has the effect of increasing the total value one way or another. So cost savings always results in increased value or benefit to the society.
So when a worker is replaced, by cheap labor or by automation, it always increases the total value, and that replaceable worker really had lower value when s/he became replaceable -- or, you could say, became lower in value, or became less valuable at the point when it became possible to do the replacement.
And it's nonsensical to say workers are paid
only according to their replaceability and not according to their value = incoherent. It's both. The replaceability and value of their work (performance) are what determine the wage level and thus the replacement of workers by someone or something less costly.
I.e., it's the less replaceability and the higher value and the more scarcity which cause the wage level to be higher. And it's the opposite -- the more replaceability and lower value and less scarcity -- which causes the wage level to be lower (or the replacement of a worker more likely).