Passage Summary: The city believes that building a center will bring in professional groups, which means more tourists and, eventually, more tax money.

Conclusion: Building the proposed convention center will result in an increase in the city's tax revenues.

Reasoning: The center will attract national professional organizations; large conventions lead to more visitors; and more visitors lead to higher tax revenues.

Analysis: The argument builds a chain: Center → Professional Orgs → ? → More Visitors → More Tax. There is a missing link between 'Professional Orgs' and 'More Visitors.' The second premise says 'large conventions' bring visitors, but we don't actually know if the professional organizations' conventions are 'large.' To make this argument bulletproof, we need an assumption that bridges this gap. Look for an answer that confirms these specific professional conventions will indeed be large enough to trigger the increase in visitors.