Earlier we saw how the Labor Theory of Value (LTV) proclaimed that the value of something is roughly equivalent to the labor that goes into producing it. A more general form is the "cost-of-production" theory of value -- basically, that something's value is determined by the cost to produce it.
I've cautioned that this isn't the appropriate way to value something -- labor, planes, toothbrushes, translation services, etc. To explain why, allow me to pose to you an age old question that perplexed some very smart people: what's more valuable, water or diamonds?
Most people will say, "duh! water is much more valuable than diamonds! You can't live without it for goodness sakes!" Great. So if I offer you a glass of diamonds or a glass of water, you're going to choose the water? Hello?
How do we resolve this? On the one hand we all acknowledge that water is necessary to sustaining life and therefore more valuable than any amount of diamonds. On the other hand, we'd trade a glass of water for a glass of diamonds in a heartbeat? This is the "diamond-water paradox" in economics.
It was initially resolved by a frenchman named Turgot. He said that value was in the eye of the beholder -- that value was subjective. Things don't have value in and of themselves, but only insofar as people have a desire for them. This desire changes continuously based on a person's needs and the relative options available at the time.
So when water is plentiful, we prefer diamonds. When stuck in the middle of a desert, we'll trade a truckful of diamonds for a glass of water.
In the 1870's the economists Jevons, Walras, and Menger each independently took this idea and ran wild with it. What resulted is the "marginal revolution." The simple version is that the value of something is determined by its exchange value. The exchange value is determined by its marginal utility. Value is driven at the margin by demand.
In other words, what something costs to produce doesn't determine its value, although the cost to produce may determine if it in fact gets made. It's value is whatever it can be exchanged for at the time we wish to exchange it.
Using this information, you tell me -- what's a fair wage?
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