Again, that's like claiming a Tesla is just like a Yugo before the Tesla label is put on.
I don't see why you want to have so much difficulty with this simple idea.
In my example, I had
one dress. One.
It was sewn by expert seamstresses in the Chanel salon. It had whatever value a dress of that quality and ugliness has in the fashion stores, regardless of who made it.
Then the label was sewn on. It did not change the quality or the appearance of the dress in any way whatsoever. Suddenly, with the addition of another 45 seconds' labour by the very same seamstress, that very same dress multiplied in market value. If that seamstress sewed on a George label, the dress would instantly lose market value, in spite of its high quality.
That value is increased or decreased simply by the name - and how the buyer feels about that name.
If your example were one single car, made by the mechanics in the Tesla factory of the same materials they always use, with the same skill and care they always take, then your analogy would be appropriate:
then and only then would that one car have a specific actual value, which could then be increased or decreased by the the addition of one or the other label - that is, by the potential buyer's preconception about the names.
So: Value is
not created by labour alone. A second factor is relative desirability - which, itself, has several components: quality of materials, standard of workmanship, skill level of the worker(s) involved, cultural bias, snob appeal, brand association - which itself has at least two components: real-world reputation and success of advertising.
Correct. But the value of the labor to mine a pound of diamonds is much higher than the value of the labor to mine a pound of coal, due to the scarcity of diamonds.
true. Diamond miners are paid double the salary of coal miners. Of course, they don't live in the same country, so the comparison is approximate, at best. However, diamonds are worth considerably more than double the value of coal, anywhere.
So then, there is yet another factor in determining value: Scarcity.
Plus, a diamond has to go through quite a lot more skilled labour (It's a rare housewife has the tools and expertise to cut and set a diamond! Pace, Captain!), while the coal has only to undergo one-stop, largely automated processing. The diamond is sold on from one owner to another, increasing in price at each transaction, until it reaches a retail outlet and becomes available to the end-buyer. Along the way, it requires constant guarding and insurance against theft, which all adds to the cost of maintenance, which cost is added on to the final price.
So then, we have to add: markups, cost of handling and specialized facilities.
That's a very long way, and several orders of abstraction beyond growing a hop vine, or kicking a stone.
And there are even more factors. Each step beyond practical labour and its physical product introduces a less constant, less measurable, less reality-based variable.
Thus: value is an abstract idea, not inherent in things, but projected onto things by sentient beings.
It begins, in the most primitive stage with the needs of a sentient being and the perceived utility of an object. But it is extrapolated, in highly complex human societies to such a level of abstraction as to have become
almost entirely arbitrary.
Almost - because in crises, the lowest level of practical valuation still prevails. If you're cold enough, a sack of coal is worth a diamond necklace.