[crpatino]

What makes Labor Theory of Value fundamentally flawed? The fact that it has the letters M, A, R and X tied to its authoriship?

I agree that toilling at useless task adds zero value in the best case -more often than not, it adds negative value by creating commitments to perform further useless tasks in the future- but what is so wrong with considering costs of production within the value added? I think it makes more sense to recognize zero (or negative) value added task for what they are instead of declaring them "marginally valueable" and then try to push the externality of their cost unto others.