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What is the opposite of Economic Bubble? 
A financial panic is in my mind would be the opposite of a bubble. A bubble is irrational exuberance -- uncontrolled exhilaration. People will ignore anything negative and exclusively focus on the positive. People are focused on investments that offer huge returns in a short timeframe. If you recall 1999, there were books published about the Dow being at 30,000 by 2010. A panic is the direct opposite -- people are irrationally fearful. Any negative news is focused on exclusively, and positive things ignored. People are focused on preserving wealth and by pursing "safety". Today, you turn on the radio and people are advertising canned food and gold coins.