by Hyperion » Wed Aug 29, 2012 9:21 pm
Marxism is not a perfect theory - no theory is - but in Das Kapital value is assigned subjectivity based on usefulness and trade-value in the market. It's a myth promoted by ideological opponents of Marx that he thought labor translated into an objective value. Granted a lot of what Marx wrote in his later years was convoluted, but it's clear he's referring to labor as being the first determining factor to to price equilibrium, not exclusively. I don't have my old copy of Das Kapital laying around (but ironically some of Hayek's works are on my adjacent bookshelf), but I believe he even qualifies his position by saying that individual preferences alter the value for consumption.
If the labor required to acquire diamonds tomorrow suddenly decreased (such as finding a huge reserve, or being able to grow them from simple carbon), the value would significantly change. It might have taken you ten years to find that one diamond, but now that they're a dime a dozen, no one cares. That is the point Marx is promoting: a vision of value being ascribed mostly by labor and social interactions.