![Mahmood Siddiqui on Twitter: Mahmood Siddiqui on Twitter:](https://pbs.twimg.com/media/CXeVN8CWcAAxBAv.png)
Mahmood Siddiqui on Twitter: "@MarketWatch you cannot list out black swans before their manifestation. That's the definition of black swan."
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What is a Black Swan event?. Necessary and sufficient conditions | by Jørgen Veisdal | Cantor's Paradise | Medium
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