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Why is Insider Trading Illegal?
Capitalism works best when there is transparency.  Your secret formula for wealth in the stocks should be based on a fair and free market, as sdg said, it is your clever interpretation of the facts, not the facts themselves.  The keyword is fair. Secrets are useful for manufacturing or production, which is only a small part of capitalism.  Even then we had to devise a system to protect ideas (patents, trademarks and copyrights) because as they succeed in the market, their secrecy goes away quickly.