Investing by the Books cover image

#13 Chris Mayer: 100-Baggers

Investing by the Books

NOTE

The Kelly Criterion on Concentration

The Kelly Criterion provides a mathematical way to determine the optimal percentage of one's portfolio to invest in, based on probabilities and potential returns. While originally derived from gambling, it can be applied to investing by adjusting for unknown probabilities. Investors often choose to allocate less than the full Kelly percentage to minimize risk. Setting a personal rule to limit investment in a single holding to 10% of the portfolio helps prevent overexposure and potential losses due to mistakes. Diversification is key to balance the portfolio and mitigate the unpredictability of performance rankings among holdings.

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