Passage Summary: To have a real free market, buyers need to be able to check prices against what something is actually worth. The author claims auto repair doesn't count as a free market, even though they give out price estimates.

Conclusion: The auto repair industry does not constitute a properly functioning free market.

Reasoning: A free market requires buyers to be able to contact many sellers and compare prices to an item's actual worth, but the author implies the auto repair industry fails these criteria.

Analysis: This is a Sufficient Assumption question, so we need a bridge that guarantees the conclusion is true. The stimulus tells us what a free market *needs*, and then says auto repair *isn't* one. To make this logic bulletproof, we need an assumption that confirms the auto repair industry lacks one of those requirements. Look for an answer that explicitly states customers cannot determine the 'worth' of a repair or that the sellers aren't truly independent. If they can't judge the value, the market fails the author's test by definition.