What is the "real cost" of a loaf of bread? It doesn't make sense to talk of things as if they have an absolute inherent dollar value, as both the cost to produ

What is the "real cost" of a loaf of bread? It doesn't make sense to talk of things as if they have an absolute inherent dollar value, as both the cost to produce these things and the relative utility of dollars both change. The asymptotic bound assumes current technology and current dollar values, which are both going to change in the tens of years involved.