Passage Summary: Because pizzerias keep better records of who their customers are and where they live, they are more effective at sending out mail-based advertisements than other restaurants.

Conclusion: Pizzerias utilize direct-mail marketing with greater success than other types of restaurants.

Reasoning: Pizzerias are unique in that they routinely collect and organize customer data like names and addresses, allowing them to easily categorize their customer base.

Analysis: The argument identifies a unique capability of pizzerias (data collection) and concludes they are the 'most effective' at a specific task (direct-mail marketing). However, it never explicitly states that having this data is what makes marketing effective. To bridge this gap, look for an assumption that connects the ability to identify and categorize customers directly to the effectiveness of a direct-mail campaign.