Passage Summary: Back in the day, a phone call and a soda cost the same amount. Since sodas are more expensive now, phone calls should be too.

Conclusion: Phone companies should be permitted to increase the cost of local pay phone calls.

Reasoning: Pay phone calls and soft drinks used to cost the same in the 1970s, but soft drink prices have since doubled.

Analysis: This argument relies on a 'false analogy' or an irrelevant comparison. Just because two things were priced similarly in the past doesn't mean their prices should stay linked forever. To weaken this, look for a reason why the costs of providing phone service haven't risen like the costs of soda, or perhaps why the technology has become cheaper over time. It's a classic case of comparing apples to oranges—or in this case, dial tones to carbonation.