What is the most important mathematical idea in stock trading?

One of the most important attributes of a successful day trader is simply avoiding mistakes and minimizing losses. Put simply: you do not have to do everything …
 
I can calculate the motions of the heavenly bodies, but not the madness of people." - Sir Isaac Newton

Supposedly, he lost 20 thousand pounds (equivalent of > $2 million pounds today) in the South Sea Company bubble of the 1710s.

And he wasn't just a math genius, he was the Master of the Royal Mint at the time (and had been for years), so a financial insider as well.


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James Simons (Renaissance Technologies)
said "mathematics" is most important thing in stock trading.
what would be the most important mathematical idea in stock trading ?
statistics, fluid dynamics ?

I think, it's probably counting - especially profits! :D
 
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