Passage Summary: There is a rule that you should only buy pricey antiques if you are sure they are real and you actually like them for themselves. Based on this, the author claims Matilde should not buy a specific vase on the internet.

Conclusion: Matilde should not purchase the expensive antique vase being sold online.

Reasoning: The provided principle states that a purchase is only appropriate if the buyer is confident in the item's authenticity and values it for more than just its investment potential.

Analysis: This is a Principle Justify question where we are given a 'only if' rule, which sets up necessary conditions for buying an antique. To prove Matilde *shouldn't* buy it, we need to show she fails at least one of those conditions. Perhaps she's just looking to flip it for a profit, or maybe buying an antique over the internet makes it impossible to be truly confident in its authenticity. Look for an answer that triggers the 'should not' by disqualifying her based on the principle's requirements.