If value/price is determined by labor or work inputs, explain a drop in price. Was there somehow "negative work"? The labor theory of value is bunk. 

> It is no crime to be ignorant of economics, which is, after all, a specialized discipline and one that most people consider to be a ‘dismal science.’ But it is totally irresponsible to have a loud and vociferous opinion on economic subjects while remaining in this state of ignorance.

-- Rothbard