PyramidHead
Contributor
This is a basic, well-worn criticism of Marx that presents an alternative conception of value, which predictably rescues the capitalist from the spotlight as an antagonist to the worker. These were exactly the same kinds of arguments put forth in times of slavery to absolve the slaveowners of responsibility toward their chattel, or in feudal times to create the impression that lords were deserving of fealty from their subjects and serfs. Always, there is the implication that those in socially sanctioned positions of hierarchical authority earned their spot and are shouldering the appropriate amount of burden. Marshall and Menger dutifully playing their roles in this performance, entirely anticipated by Marx in his analysis of bourgeois economics that were contemporary to him, hardly undermines his overall thesis.
The problem with the labor theory of value is that it in effect says that finding a more efficient way to do something is bad, not good.
What are you even smoking. Marx's value theory is about exchange value, not use value. Something with a given use value will become less valuable in the sense of exchange as it gets easier to produce, but this doesn't make it worse, it just means it can't fetch the same price as it used to.