If one believes that they are incorrect, he is effectively stating that he (someone thinking abstractly in the absence of any hard data) is better at pricing th

If one believes that they are incorrect, he is effectively stating that he (someone thinking abstractly in the absence of any hard data) is better at pricing the value of the work than the manufacturer (who is directly affected by the outcome and has a wealth of hard data). The pricing error argument can be made based on a definition of "value" that is in fairly common use around here (market price) and no more data than is included in the article: they offer a certain price for the labor and don't get as much of it as they want, therefore the price they offer is lower than the value.