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by forgotusername 4985 days ago
Free markets are not immune to panic.. a few hours break in trading that affects everyone is fair, and allows participants time to analyse whatever news release occurred, rather than knee-jerk liquidization of their positions, which they may come to regret after cooling off.

This one was automated AFAIK, since GOOG dropped so hard. See http://en.wikipedia.org/wiki/Trading_curb