Commentator: For a free market to function properly, each prospective buyer of an item must be able to contact a large number of independent prospective sellers and compare the prices charged for the item to what the item is worth. Thus, despite advertised prices and written estimates available from many of its individual businesses, the auto repair industry does not constitute a properly functioning free market.
The assumption that many auto repair shops charge more for auto repairs than these repairs are worth is necessary for the commentator's argument to be logically valid.