Passage Summary: Some companies force managers to rank everyone from best to worst, but the author thinks this is a bad deal for workers because it's arbitrary and punishes good people who happen to be on great teams.

Conclusion: The worker ranking system used by certain companies is unfair to the employees.

Reasoning: High-performing employees might be ranked low simply because their peers are even better, and managers often base rankings on personal social interests rather than work performance.

Analysis: The conclusion is signaled by the transition word 'But,' which shifts the passage from a description of the ranking system to the author’s critique of it. I identified 'this system is unfair' as the main point because every sentence following it serves as a specific example or reason supporting that claim. When you see a 'description-then-evaluation' structure like this, the evaluation is almost always your conclusion. Don't get distracted by the specific examples of unfairness; they are just the evidence.