Passage Summary: Since selling off phone companies to private business worked out well for customers, we should do the same with national parks to help tourists.

Conclusion: Privatizing national parks would likely benefit park visitors.

Reasoning: Privatizing the telecommunications industry was successful because competition improved service and lowered prices.

Analysis: This argument relies on an analogy between the telecommunications industry and national parks. To weaken this, we need to identify a fundamental difference between the two that makes the success of one unlikely to translate to the other. For instance, if national parks are natural monopolies where 'competition' isn't actually possible, the primary driver of the telecommunications success—competition—would be missing. Look for an answer that highlights why the market dynamics of phone service don't apply to trees and canyons.