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The Mathematical Reason Why Even "People with a 90% Success Rate" Lose in Investments, and the Truth About "Expected Value" that an Investor Who Built Assets of 700 Million Yen Places Importance On

Summary by toyokeizai.net
To continue winning in the stock market, the key factor is the "expected risk and return." This number is the "magic number" that tells you how much profit you can make on average after many trades.
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The Mathematical Reason Why Even "People with a 90% Success Rate" Lose in Investments, and the Truth About "Expected Value" that an Investor Who Built Assets of 700 Million Yen Places Importance On

To continue winning in the stock market, the key factor is the "expected risk and return." This number is the "magic number" that tells you how much profit you can make on average after many trades.

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toyokeizai.net broke the news in on Thursday, February 19, 2026.
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